1137 results about "Geomembrane" patented technology

A cover system is provided for waste sites and environmental closures, in which the cover system comprises a synthetic grass and an impermeable geomembrane that can be applied without the use of heavy earthwork equipment as temporary or final cover to control odors, erosion, gas migration and contaminate migration. The invention allows installation on very steep slopes and does not require the use of an extensive anchoring system to resist wind uplift or slope failure.

A tough, high-strength geomembrane made from a custom blend of polyethylene copolymers, for protecting waterproofing courses from impact and pressure damage of debris resting against the waterproof course. A slip sheet configuration reduces surfaces stress due to earth movement and subsurface cracking thereby maintaining the protective course intact without any effect on the waterproofing layers. The geomembrane is available as lightweight rolls which can be easily be handled by one man. The film is installed horizontally in continuous sheets with few adhesive joints. Installation begins by applying a thick brush coat of the selected waterproofing membrane material (usually a rubber coat but may be any waterpoofing material). The film is unrolled along the wall, held up into position and secured using plastic self-sealing plugs and / or plastic termination bars. Concrete nails are used to attach the self-sealing plugs or termination bar to the wall. If termination bar is selected the film is extended up beyond the bar approximately 8'' and folded down over the termination bar after attachment. Staples into the termination bar can be used to hold the film down creating a nicely detailed upper edge.

A cover system is provided for waste sites and environmental closures, in which the cover system comprises a synthetic grass and an impermeable geomembrane that can be applied without the use of heavy earthwork equipment as temporary or final cover to control odors, erosion, gas migration and contaminate migration. The invention allows installation on very steep slopes and does not require the use of an extensive anchoring system to resist wind uplift or slope failure.

The invention discloses a method for detecting damaged pore position of leakproof geomembrane, comprising the steps as follows: firstly, a positive electrode and a negative electrode are arranged respectively on the upper surface and the lower surface of the geomembrane; subsequently, electric potential forms on the upper surface and the lower surface of the geomembrane; subsequently, an electric potential difference movable detector with a reference electrode is employed to sample and detect the electric potential difference of the coverage layer of the geomembrane; finally, the leaked and damaged position can be detected by data processing. The invention also discloses a device for detecting leaked and damaged pore position of leakproof geomembrane, comprising an excitation power supply and the electric potential difference movable detector which is provided with the reference electrode and is used for sampling and detecting the electric potential difference of the coverage layer of the geomembrane. Under a situation that the upper surface of the geomembrane is provided with the coverage layer, the method and the device can exactly detect and position the damaged pore position, repair the damaged pores in time after the coverage layer of the geomembrane is excavated and the pores are exposed, fill the garbage or accumulated water subsequently, effectively prevent garbage leachate containing harmful substance from being leaked outside the landfill site to pollute the underground water, and eliminate the harm to the survival of peripheral people, animals and plants.

The invention relates to a protection method for improving the salt expansion or the dissolution sink of salty soil, which is characterized in that calcium carbide ash, fly ash, zeolite and salty soil are adopted, are mixed and stirred according to the volume ratio of 1:1:1:9 and are used for the filler improvement of a road embankment, broken stone and gravel are adopted as a buffer layer, bitumen, geomembranes and geotextiles are adopted as a partition layer, a geogrid reinforcement improved filler is adopted, a sack filled with greening grass seeds, shrub seeds and improved soil is adopted to press the toe of a slope, and a side slope adopts the protection of the companion planting of grass and shrub and the combination of a hanging net. The invention has the following advantages of: (1) adjusting measures to local conditions, making full use of the salty soil, saving resources, utilizing wastes, such as the fly ash and the like, and realizing the utilization of the wastes; (2) adopting a structural protection system formed by the improved salty soil and a geogrid together and solving the problems of stability and uniform settlement of a fill slope; and (3) combining the grass and the shrub, reaching the ecological requirement on one hand, solidifying a sloping surface on the other hand and preventing the water and soil loss and the salt expansion or the dissolution sink. The invention is suitable for the problem of engineering improvement of the salty soil in civil engineering and can be used for the engineering of the filling of a highway embankment, the protection of the side slope, the construction of a foundation, the improvement treatment of a foundation pit and the like.

The invention provides a system and method for rapidly detecting seepage of a geomembrane in a refuse landfill. The system comprises a mobile testing car, wherein the mobile testing car is matched with a testing probe, a signal processing circuit, a data acquiring system, a GPS (Global Position System) positioning device and a computer data analysis and model establishing system; and the testing probe is connected with the anode of a high-voltage (1000V) signal source through a lead, and the cathode of a high-voltage (1000V) direct signal source is connected with a high-voltage electrode. When a device for rapidly detecting seepage of the geomembrane in the refuse landfill is used for detection, large-scale soil aeration on the refuse landfill is not needed, and paving of a plurality of detecting electrodes is also not needed; and when seepage detection is carried out by using a high-voltage direct-current method, a seepage point can be rapidly searched through orienting and positioning by using a voltage field multi-dimensional vector analysis method which is different from the traditional plane voltage field analysis method. By using the GPS navigation of a vehicle-mounted detecting system, the detection process is accelerated, the detecting efficiency is increased, and the labor intensity is reduced.

A system for covering (i.e., closing) various types of sites where waste is deposited comprises a composite of one or more geotextiles that are tufted with synthetic yarns and an impermeable geomembrane, which is comprised of a polymeric material. The cover can include wind-resistant textured synthetic blade-like elements, such as vertical filaments, secured over a low-permeable polymer liner backing. Advantageously, the system does not rely on piled-on weight to resist wind forces and the cover can be deployed over a large area with little or no ballasting or anchoring. Optionally, the cover includes vertical filaments attached to the liner to break the wind aero-dynamics on the exposed cover.

The present invention is electric detecting method and device for leakage of antiseepage layer garbage landfill. There are at least one emitting electrode set on earthwork film inside the landfill, one receiving electrode embedded inside soil outside the landfill, DC power source connected to the two electrodes; at least one detecting electrode laid under the earthwork film, one reference electrode laid outside the landfill and one seepage detecting instrument, which consists of motor, main control box and datan acquiring box, connected to the detecting electrode and the reference electrode.

The invention discloses a method for greening and restoring a hard side slope. The method comprises the steps of cleaning a slope surface, arranging an anchor rod, laying a galvanized wire mesh sheet,improving red sandstone into planting soil, laying a geomembrane, executing sowing, establishing an automatic irrigation system and executing operation and maintenance, wherein the red sandstone soillayers with different sandstone contents are improved by adding an improver, meanwhile spray heads are installed on a pre-buried spray system by utilizing an automatic control system, and planted plants are irrigated by using the spray heads. A sprinkling irrigation system can be automatically controlled according to temperature and humidity. The invention provides a hard slope greening restoration technology for improving red sandstone into planting soil. Long-term growth conditions are provided for vegetations, the ecological restoration requirements of a rock slope and a hard slope are met, slope protection greening planting plants are combined with a traditional vegetation concrete ecological-restoration technology, vegetation restoration and anchoring fixation are simultaneously carried out, and the vegetation growth on slopes and slope fixation can be better achieved.

The invention provides an en expansive soil road cutting side slope reinforced soil back-pressure seepage-preventive supporting structure and a construction method thereof. The supporting structure comprises an expansive soil road cutting side slope, a slope toe retaining structure is arranged at the toe of the slope, a geomembrane seepage-preventive structure, a reinforced soil slope surface protection structure and an anchor rod system are arranged on the surface of the slope, and a slope top back-pressure seepage-preventive structure is arranged at the top of the slope. The supporting structure is simple in form, the protection structure is high in flexibility and short in construction period, the problems of stability and construction period of an expansive soil high slope can be solved effectively, and the supporting structure is an innovation for high and steep expansive soil road cutting side slope excavation scheme and supporting technology in the field of railway engineering.

The use of water soluble product in construction that is at least partially encapsulated by a water resistant membrane layer, particularly, the use of phosphogypsum, preferably leached phosphogypsum, that is at least partially encapsulated by a geomembrane layer, thus enabling the use of phosphogypsum as a construction material.

The invention relates to a closed direct-sucking sectional vacuum preloading foundation treatment method. The technology comprises the following contents: an installed vertical plastic drainage plate comprises a part inserted in a soil body and a part flatly attached to the soil surface, a drainage system on the surface of the soil body is composed of the part (of the plastic drainage plate) flatly attached to the soil surface, a seal joint, an air-tight sealing water pipe and an air-tight main sealing pipe, and then after an operation of geomembrane sealing is completed, the drainage system is connected with a vacuumizing device so as to carry out closed direct-sucking; for a vacuum preloading foundation treatment project which carries out pretreated cushion layer construction by using the joint application of long and short plates, after an operation of carrying out pretreated cushion layer construction on the short plate construction is completed, in the process of installing the long plate to carry out deep foundation treatment, filter cloth (in a shallow soil body section) in the part that the long plate is inserted in the soil body is subjected to surface sealing treatment or directly replaced with the sealing water pipe, so that the long plate of the vertical plastic drainage plate is changed into a three-section pipe with an air-tight middle section so as to carry out sectional direct-sucking. By using the technology, a vacuum degree transfer effect is improved while the duricrust layer on a surface soil body is formed and the strength of a deep soil layer is improved, thereby realizing the rapidness, high efficiency and energy saving of construction.

The invention concerns a mixture comprising by weight, the total being 100%, 1 to 100% if a polyamide block copolymer consisting of a basic polyolefin chain and on an average at least a polyamide graft wherein: the grafts are fixed to the basic chain by the radicals of an unsaturated monomer (X) having a function capable of reacting with a polyamide with amine terminal, the radicals of the unsaturated monomer (X) are fixed to the basic chain by grafting or copolymerization from its double bond; 99 to 0% of a flexible polyolefin with elastic modulus in flexure less than 50 MPa at 23° C. and having a crystalline melting point ranging between 60° C. and 100° C. Said mixtures are useful for making films, tanks, geomembrane protective fabrics produced by extrusion, products obtained by calendering, thermocladding / forming, protective films for electric cables and skins using slush molding technique.

The invention discloses a high speed railway embankment structure in salty soil regions. The high speed railway embankment structure comprises a ground stabilization body arranged in soft foundation, wherein a reinforced mattress layer is laid above the ground stabilization body; a salty soil isolation layer is laid above the reinforced mattress layer; a filling embankment is laid above the salty soil isolation layer. The high speed railway embankment structure is simple in structure and convenient to construct, the reinforced mattress layer on the base is fully utilized as a carrier, the isolation measures are taken through the salty soil isolation layer made by taking a composite geomembrane or a capillary drain board as a main body, the high speed railway embankment structure is small in layer thickness and relatively low in material price and has obvious advantages compared with the measures of excavating a great quantity of salty oil, reducing underground water level, permeating water and soil or isolating asphaltic sand, the project investment can be obviously reduced, the environmental pollution is alleviated, capillary water of the salty oil can be effectively prevented from eroding the embankment body, and high service performance and long-term stability of the embankment engineering are guaranteed.

The invention discloses an electrical detection method and device for leakage of a refuse landfill. The electrical detection method is as follows: arranging upper-layer conducting wires in a clay layer at the upper part of a geomembrane in the landfill; arranging lower-layer conducting wires in a clay layer at the lower part of the geomembrane in the landfill; forming a power supply circuit and a measuring circuit with a power supply electrode and a remote electrode; judging whether holes exist on the geomembrane by utilizing whether current exists in the power supply circuit; and determining the specific respective positions of the holes by detecting potential data of the measuring circuit when the holes exists. A line current source is formed by the conducting wires arranged on the landfill, and leakage detection is carried out by utilizing the space distribution characteristic of the line circuit source, therefore, the problem that the existing detection method has the defects of low resolution ratio, complex wire distribution, high detection cost and the like can be effectively solved.

The invention relates to anti-seepage cofferdam structure and a construction process. The cofferdam structure comprises a vertical anti-seepage body arranged in the middle of the end face of a cofferdam, wherein the bottom of the anti-seepage body extends to be embedded into a river bed covering layer, a main body of the anti-seepage body is formed by filling a multi-layer gel and sand gravel mixture, a vertical anti-seepage insulating layer is arranged on one side of the anti-seepage body and is a layer of geomembrane clamped between two geotextiles, a trapezoid cofferdam body is arranged on the other side of the anti-seepage insulating layer, and a lead wire gabion is arranged on the other side of the anti-seepage body. The construction process comprises using a backhoe excavator to remove large stones in a basic region after a temporary cofferdam is built; then using the backhoe excavator to dig a groove with 1.2m width and 3m depth along the cofferdam axis, and back filling the multi-layer gel and sand gravel mixture in layers to construct the anti-seepage cofferdam structure. The anti-seepage cofferdam structure is simple in structural style, the construction method is easy, and the anti-seepage effect is good. A construction period is shortened, fund is saved, and a simple and effective method is provided technically.

The invention discloses a method for improving slope stability of expansive soil and controlling structural damage of the expansive soil. An expansive soil slope form obtained through the method prevents direct contact of the expansive soil and the atmosphere and effectively avoids weathering of the expansive soil. A water-proof geomembrane is covered on a surface layer of the expansive soil, drainage facility is arranged on the surface layer of the expansive soil, variation range of water-containing rate in the expansive soil can be effectively reduced, and expansive deformation of the expansive soil is reduced. An overlaying load function further limits expansive and shrinkage deformation of the expansive soil and generation and development of fractures, avoids structural damage of the expansive soil, and prevents the structural strength from being reduced, each stagee of stopping wall adopts a flexible protection structure which can avoid damage of the structure caused by discordant deformation between the expansive soil and the structure, so that a slope protection structure has strong capacity to be adapted to deformation and antidumping capacity. The method for improving slope stability of expansive soil and controlling structural damage of the expansive soil is simple and convenient to construct and good in effect.

The invention discloses a seepage-proof pool and a mounting method thereof. The seepage-proof pool comprises a circular pool body formed by successive arrangement of a plurality of combined retaining barriers; and the adjacent combined retaining barriers are detachably connected and are made of metal materials. A first geomembrane that is laid in the circular pool body and can cover the pool bottom and pool wall of the pool body consists of a first seepage-proof layer, a second seepage-proof layer, and a third seepage-proof layer, wherein the layers are successively arranged and are bonded and are made of polyethylene materials; and black master batches are added into the first seepage-proof layer. The provided seepage-proof pool can be dismounted or assembled rapidly and can be transported conveniently; and the used materials can be recycled, so that the cost is saved.

The invention relates to a construction method for processing a saline soil roadbed by a separation layer, comprising the following steps: the separation layer is arranged in a mode that compound geomembranes cover a gravel soil separation layer; the compound geomembranes are laid according to the width of the cross section of the roadbed; firstly, an inner compound geomembrane is laid; then an outer compound geomembrane is laid; the compound geomembranes are flatly laid and tightly adhered to the surface of the roadbed; the gravel soil separation layer is laid on the compound geomembranes and is filled and laminated by layers; the compound geomembranes cover the gravel soil separation layer; gravel soil is filled between the separation layer and the original roadbed surface layer; and the degree of compaction of the top layer is above 97%. According to the construction method disclosed by the invention, the saline soil can be effectively prevented from carrying out salt expansion, corroding and the like on the roadbed, a road surface structure layer can be prevented from damaging, the construction is convenient, the cost of engineering construction can be lowered, the curing cost is reduced, and the stability and the service life of the roadbed can be improved. The practice proves that the scheme brings a better technical effect in the saline soil roadbed construction.

The invention discloses a high rock-fill dam membrane anti-seepage body on a deep coverage layer and a construction method of the high rock-fill dam membrane anti-seepage body. The membrane anti-seepage body is composed of a concrete protection layer, a geomembrane anti-seepage layer, a flexibility cushion layer and a transition layer. The concrete protection layer is a cast-in-place fiber concrete layer for a reserved cross joint and a vertical joint and located on a surface layer to protect a geomembrane. The geomembrane anti-seepage layer is a two-cloth and one-membrane composite geomembrane and is located in the middle to play a role of preventing seepage. The flexibility cushion layer is a polyurethane pervious concrete layer and located at the bottom of the anti-seepage body to support the geomembrane and to transmit and disperse water loads. The rough granule transition layer is arranged between the flexibility cushion layer and a rock-fill dam body. The construction method comprises the technical steps of filling and building the transition layer, pouring the flexibility cushion layer, paving the composite geomembrane, pouring the concrete protection layer and the like. The membrane anti-seepage body can keep stable on a high rock-fill dam slope, the ability of adapting to deformation of a coverage layer dam foundation and the dam body is high, the structural form is simple, construction is fast, and the anti-seepage problem of the high rock-fill dam on the deep coverage layer can be effectively solved.

The invention discloses a device for testing the penetration and deformation of an impervious material of a gasket of a landfill site. The device comprises a pressurization device, a data control device, a testing vessel and a data processing device; the testing vessel consists of two hollow hemispheres with wing edges; the impervious material of the gasket is arranged between two hollow hemispheres; and the testing device measures pressure at two sides of geomembrane to obtain the pressure difference, provides parameters for the deformation of the geomembrane under certain pressure and can establish a pressure-deformation quantity relation. The testing device has the functions of measuring the osmotic coefficient and the deformation of the impervious material of the landfill site and also has the function of measuring the osmotic coefficients under different pressures. Data acquisition of the testing device ensures the simultaneity of the data acquisition to allow the measured osmotic coefficient to be more accurate. The osmotic coefficient measured by the testing device can be directly read and also establish relations between the pressure and the osmotic coefficient and between the pressure and the deformation quantity; therefore, the device provides more reliable evidence for the engineering application and the estimation of imperviousness of the geomembrane.

The invention relates to a scheme for quickly positioning breakage of an inner geomembrane in anti-seepage engineering, belonging to the technical field of anti-seepage in hydraulic engineering (civil engineering). The method of the invention comprises the following steps of: integrating continuous fibers and the geomembrane, wherein the fibers are arranged uniformly like a snake in the geomembrane, and the distance among the optical fibers is less than or equal to a strain sensitive distance of double fibers; taking the geomembrane as an anti-seepage material and conducting light paths of the fibers in the whole anti-seepage area; leading out the terminals of the fibers to a fiber strain detecting device for covering a protective layer of the geomembrane; and according to the arrangementdesign of the anti-seepage engineering, establishing a conversion expression between the fiber length L and the XY coordinate values of an anti-seepage surface. Fiber open circuit or abnormal strain caused by the breakage of the geomembrane can be found by a distributed detection system, and the breakage position of the geomembrane can be quickly and accurately determined by the conversion between the fiber length and a laying distance, thereby gaining precious emergency repair time for a dam of which the geomembrane is damaged, and effectively reducing the occurrence of dam collapse disasters.

The invention relates to a metallocene geomembrane which is used for railway laying, a refuse landfill, a tunnel, a penstock, a reservoir, a dyke, a sewage tank, an ecological tank, a landscape lake, an aquiculture tank and the seepage resistance and the water resistance of railway and highway engineering and is prepared by ingredients through a coextrusion machine. The metallocene geomembrane is characterized by comprising the following components by the weight percent: 64 to 73 of metallocene linearity low-density polyethylene, 24 to 32 of high-density polyethylene and 0.1 to 3 of assistant, wherein the assistant comprises a modifying assistant and a processing assistant, the modifying assistant is the antioxidant, and the processing assistant is carbon black or PPA. The Metallocene geomembrane has good puncture resistance, good,anti-tear property and high tensile strength.

The invention discloses a compound type perpendicular seepage-proofing screen which is used for preventing horizontal seepage of pollutants in soil or underground water. The compound type perpendicular seepage-proofing screen comprises a perpendicular flexible seepage-proofing part and a by-pass seepage preventing part, wherein the perpendicular flexible seepage-proofing part comprises a rectangular HDPE (high-density polyethylene) geomembrane; the by-pass seepage preventing part comprises a by-pass seepage preventing supporting part and self-hardening mud which coats the by-pass seepage preventing supporting part; the by-pass seepage preventing supporting part comprises gridding cloth and sodium-based bentonite encapsulated in the gridding cloth, and a groove is formed in the surface of the by-pass seepage preventing supporting part; the bottom of the perpendicular flexible seepage-proofing part is embedded and inserted into the groove of the by-pass seepage preventing supporting part, and the bottom of the perpendicular flexible seepage-proofing part is fixed with the by-pass seepage preventing supporting part through a bolt. The compound type perpendicular seepage-proofing screen has the advantages of being simple in construction, good in seepage-proofing effect, and the like, and can be used for solving the by-pass seepage problem on a joint of the HDPE geomembrane and an underground water-impermeable layer.

A containment system includes a geomembrane liner positioned over a ground surface. An anchor member is provided beneath the geomembrane liner and includes a fastening plate adapted to be secured to the geomembrane liner. The geomembrane liner is positioned over the ground surface and anchor member and is secured to the fastening plate. Dirt or other covering material may then be provided in the hole and over the geomembrane, or the geomembrane may be left exposed.

The invention discloses a double-layer steel sheet pile soil core composite cofferdam structure without an inner support and the application of the double-layer steel sheet pile soil core composite cofferdam structure without an inner support, and belongs to the field of water conservancy projects. The double-layer steel sheet pile soil core composite cofferdam structure without an inner support comprises an upstream-face steel sheet pile and a downstream-face steel sheet pile, and the space between the steel sheet piles is filled with cohesive soil to form a cofferdam; a composite geo-membrane is laid on the portion, inside the cofferdam, of the upstream-face steel sheet pile; the upper portions of the two steel sheet piles are connected through a pull rod, middle beams are arranged outside the steel sheet piles, and the pull rod is connected with the middle beams through bolts arranged outside the corresponding middle beams. When the filling cofferdam core cohesive soil is in the same level with the pull rod, the space between the steel sheet piles is further filled with a layer of hairy residues, and a sub-cofferdam is arranged on the upstream-face steel sheet pile. The cofferdam structure can be used for building strip-shaped subsurface structures in a river or lake through the open-cut method. The cofferdam structure is stable and safe, and the problem that a steel sheet pile flexible structure is large in deformation is solved by arranging the pull rod on the tops of the two steel sheet piles; a three-level waterproofing system improves the anti-penetrability performance of the steel sheet pile cofferdam significantly.

The invention discloses a method for installing a vertical soft barrier system based on a soil-stone foundation. The method comprises the following steps of: digging a ditch for installing the vertical soft barrier system; refilling anti-seepage slurry into the ditch to form a retaining wall protection layer; installing an HDPE (High-Density Polyethylene) geomembrane in the ditch by using a support tool to form an HDPE geomembrane wall; chemically grouting and sealing the bottom of the HDPE geomembrane wall to form a bottom sealing layer; and withdrawing the support tool to form the vertical soft barrier system. Due to the adoption of the method, an anti-seepage function is ensured, seepage at a joint is prevented, and isolated liquid is effectively prevented from being dispersed; the horizontal dispersion of pollutants can be prevented and blocked for a long time; a connecting lock piece has a reversely-rotatable HDPE structure of which the positive and negative surfaces can be replaced by each other, is provided with a plurality of sealing chambers, can be used for accommodating a plurality of sealing materials and joint seepage detection systems, and is easy to install and operate; an expansion water blocking gasket can expand after contacting water, so that liquid is prevented from flowing through a porous sealing device, and persistent sealing is ensured; and a large installation depth is realized.

A solar energy cover system, landfill cover system and method of use. The solar landfill cover system typically comprises a foundation layer of compacted soil above a solid waste pile and a solar cell geomembrane on top of the foundation layer. The solar landfill geomembrane preferably comprises a flexible solar portion and a flexible water impermeable geosynthetic portion. The flexible solar portion is on a top side and comprises solar cells and the geosynthetic portion is on a bottom side and comprises a layer of a flexible water impermeable geomembrane.

The invention discloses a method for treating a deep soft soil foundation by combining a chemical electro-osmosis method and a vacuum preloading method. In the method, vertical porous drain pipes and metal electrodes are inserted and chemical solution is injected into the soft soil foundation, horizontal drain boards and seal geomembranes are laid on the top of a soil layer, direct current is supplied, vacuumization is carried out, and under the action of direct-current electric field force, water with positive charge and cation solution flow to a cathode and anion solution with negative charge flows to an anode to form electro-osmosis and chemical reaction; meanwhile, under the action of internal and external pressure difference formed through vacuumization, water is quickly discharged from the drain pipe in which the cathode is positioned; and the solidification and compactness of the foundation soil are accelerated and the soil strength of the soil is improved. Compared with the common vacuum preloading method, the method has the advantages that: the soft soil treatment depth is increased, the deep layer of the soil of which the vacuum degree is difficult to reduced can be reached, and under the action of the direct-current electric field force, the solidification rate of the soil is improved and the construction period is shortened. Through the method, the construction process is simple, the operability is high, the construction period is short, the quality control and detection are facilitated, and the soil strength is improved obviously.

A geomembrane liner for a containment system including liner panels and connected by a seam at overlapped edges, with the top panel having a conductive lower surface which is non-conductive across the seam. Heat welding of the seams is accomplished by a welder having a heating unit with a projection which interrupts the conductive lower surface of the top panel before forming the seam. Such seams may be used separately or selectively with a lined containment system having a plurality of liner panels covering at least a portion of the containment system bottom. The liner panels have a conductive lower surface and overlap with adjacent panels, and conductive members underlie adjacent panels and contact the conductive lower surface of both adjacent panels to provide an electrical connection between the conductive lower surfaces of the adjacent panels.