Construction method of geogrid reinforced clay edge-covered tailing subgrade

Abstract

The invention discloses a construction method of a geogrid reinforced clay edge-covered tailing subgrade and belongs to the technical field of subgrades in the civil engineering. The construction method comprises the following steps: foundation treatment, sand gravel underlayer construction, laying of a two-way geogrid and water-permeable geotechnical cloth, feeding laying operations of clay edge-covering layers on the two sides of the subgrade and a tailing subgrade main body layer by layer, rolling construction, one-way geogrid construction between the tailing subgrade main body and the edge-covering clay to a designed elevation, and finally, the construction of an ash doped clay sealing layer. As the one-way geogrids are laid between the clay edge-covering layers on the two sides of the subgrade and the tailing subgrade main body, the defects such as differential settlement, poor subgrade stability and the like between the two fillers, namely the clay and the tailings, are reduced. The construction method has the advantages of simple structure, low cost and convenience for construction; besides, the consumption of the tailings and the overall stability of the subgrade can be increased, the differential settlement and the usage of the earthwork of the subgrade are reduced, rainfall infiltration and capillary water rise are decreased, and the internal drainage performance of the section of the subgrade is improved.

Description

technical field [0001] The invention belongs to the technical field of roadbed in civil engineering. Background technique [0002] The main component of tailings sand is the solid mining waste formed by the tailings slurry discharged from the concentrator after the dehydration process. Its storage facility is the tailings pond, which is a major source of pollution and danger in terms of environmental protection and safety. Once the tailings pond appears The accident not only involves the production safety of the mine itself, but also affects the life and property of the surrounding and downstream residents. The main hazards include: the collapse of the tailings pond, pollution of the environment, occupation of land resources, and high operating costs. [0003] A large number of tailings sand stockpiled and increasing in my country is a huge potential source of risk, so reasonable measures should be studied to realize its comprehensive application, so that this industrial was...

AI Technical Summary

Problems solved by technology

Among them, Documents 1 and 3 did not mention that the drainage system from the inside to the outside is installed on the section of the clay-edged tailings sand subgrade, which is not conducive to the long-term stability of the subgrade; in Document 2, it is solved by setting a drainage pipe at the bottom of the subgrade, but This method has a limited drainage area and is prone to clogging

In Document 4, the upper part of the roadbed structure is sealed with sand and gravel, so the external precipitation is easy to seep into the roadbed body, and this method does not consider the installation of drainage facilities on the roadbed section, so it is not conducive to the long-term performance of the roadbed

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