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Method for constructing metamorphic rock confined water tunnel

A construction method and pressurized water technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of primary support deformation and cracking, difficulty in controlling excavation contours, and difficult construction operations, etc., to improve rock mass structure , Improve construction conditions, control hazards and destructive effects

Active Publication Date: 2010-06-30
THE 2ND ENG OF THE 12TH BUREAU GROUP OF CHINA RAILWAY
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Problems solved by technology

[0004] In order to solve the problems of existing metamorphic rock confined water tunnels using traditional tunnel construction methods, such problems as geological disasters are easily caused, excavation contours are difficult to control, initial support deformation and cracking are easy to collapse, and construction operations are difficult, etc., the present invention provides a metamorphic tunnel. Construction Method of Rock Confined Water Tunnel

Method used

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  • Method for constructing metamorphic rock confined water tunnel
  • Method for constructing metamorphic rock confined water tunnel
  • Method for constructing metamorphic rock confined water tunnel

Examples

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Embodiment Construction

[0016] A construction method for a metamorphic rock confined water tunnel, such as figure 1 shown, including the following steps:

[0017] A Preliminary prediction of surrounding rock level and groundwater development: large or special geological structures and basic geological conditions are generally marked on the geological data provided by the design, and the tunnel geological segment can be predicted in time through the TSP203 geological prediction system, which can be predicted relatively accurately The geological structure and groundwater development of the upcoming construction section. Preliminary conclusions can be drawn through careful analysis of design geological data and TSP system forecast data, and guidance will be provided for whether to implement or in which section to adopt advanced sounding prediction in the next step. Due to the dense joints of the metamorphic rock confined water tunnel and the broken surrounding rock rich in fissure water, the prediction...

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Abstract

The invention relates to the field of tunnel construction, in particular to a method for constructing a metamorphic rock confined water tunnel, which solves the problems of the current method that geological disaster is easily initiated, the digging outline is difficult to control, timbering at initial stage is easy to transform and craze and the collapse is easy to occur. The method comprises the steps of: preliminarily forecasting surrounding rock level and underground water developing condition, accurately forecasting the geologic condition and the underground water developing condition by an advanced prospect hole, draining and decreasing water pressure by an advanced borehole, fixing the surrounding rock and plugging water by grouting via an advanced ductile, choosing a digging manner of tunnel trunk, determining the timbering form at initial stage, constructing a radial ductile, digging an inverted arch, pouring inverted arch concrete, and constructing a secondary lining. The construction method of the invention can efficiently control the digging outline, decrease the collapse frequency and the scale, efficiently control the transformation and cracking of the timbering at initial stage and can almost avoid the tunnel collapse by secondarily exchanging arch. The cost is decreased and the construction quality and the construction safety are efficiently promoted so as to bring excellent social benefit.

Description

technical field [0001] The invention relates to the field of tunnel engineering construction, in particular to a construction method for a metamorphic rock pressurized water tunnel. Background technique [0002] The surrounding rocks of metamorphic rock confined water tunnels are characterized by the development of joints and fissures, the joint surfaces are dense and smooth, and the rocks are in the form of massive or fragmented crushed structures. , Weak self-stabilization ability, multi-layer pressurized water causes water to flow out of the cave body after excavation and gradually become larger, or water will flow out and gradually become larger after a few days of no water after excavation. The support structure is stable and safe when no water comes out. Once the water comes out, the filling in the crack will soften and be lost with the water, which will deteriorate the integrity and stability of the surrounding rock, increase the pressure on the support system, and ca...

Claims

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Application Information

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IPC IPC(8): E21D11/38E21D11/10
Inventor 王利民赵香萍谷孝军张朝亮
Owner THE 2ND ENG OF THE 12TH BUREAU GROUP OF CHINA RAILWAY
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