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Sandy clay geological tunnel roof collapse treatment method

A treatment method and technology of soil geology, applied in the direction of tunnel, tunnel lining, earthwork drilling and mining, etc., can solve the problems of inaccurate geological forecast analysis, complicated construction technology of large pipe shed, improper treatment of roof surface, etc., and achieve obvious reinforcement effect, The effect of reducing construction risks and reducing the accident rate of pipe breakage

Active Publication Date: 2018-10-19
CHINA COMM NORTH ROAD & BRIDGE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During tunnel construction, especially in tunnels with sandy clay soil, roof-fall collapse accidents often occur. There are some deficiencies in the existing methods for dealing with roof-fall collapse accidents: for example, the advanced geological forecast analysis is not accurate enough, the roof-fall surface is not handled properly, and the large pipe The construction process of the shed is complicated, the construction period is long, the hole is difficult to form, and the hole is easy to cause collapse, etc.

Method used

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  • Sandy clay geological tunnel roof collapse treatment method
  • Sandy clay geological tunnel roof collapse treatment method
  • Sandy clay geological tunnel roof collapse treatment method

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Effect test

Embodiment

[0056] Take the roof fall accident ZK15+196 in the shallow buried section of the left tunnel of the No. 2 tunnel in a place as an example. A roof fall accident occurred at the location of the tunnel karst cave. The original ground formed a depth of about 6m and an area of ​​about 157m. 2 The collapsed pit is located in the villager’s courtyard, about 10m away from the house (double-layer brick-concrete building). The collapsed pit caused damage to the villager’s courtyard wall and ground. The collapsed body in the tunnel was extremely fragmented and was in the shape of quicksand with mud gravel.

[0057] Within this section, the ZK15+175-ZK15+200 section of the present invention’s advanced geological forecast analysis shows that the tunnel face joint cracks (or karst grooves) are developed, the rock mass is in a thin layered structure, the rock mass is broken, and the tunnel There is fissure water on the surface, the amount of water is average, and the degree of structural surface...

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Abstract

The invention discloses a sandy clay geological tunnel roof collapse treatment method. The method includes the steps of carrying out advanced geological forecasting, conducting roof collapse earth surface treatment, carrying out in-hole backpressure backfill, achieving advanced support through small conduits, adopting a follow-pipe drilling method based on alternate application of drilling tools for carrying out dual-layer pipe shed advanced pre-reinforcement treatment, conducting excavation, and continuing monitoring measurement after construction is finished. The sandy clay geological tunnelroof collapse treatment method is safe and reliable, the construction risks of tunnels can be reduced, the reinforcement effect is obvious, secondary collapse of a vault can be effectively controlled, construction is convenient, and the project quality can be ensured.

Description

Technical field [0001] The invention belongs to the technical field of mining, and particularly relates to a method for treating roof fall of a sandy clay soil tunnel. Background technique [0002] In the current and future periods, the construction of highways and railways in mountainous areas in my country has always been a key project. Road construction in mountainous areas and tunnels are essential structural projects, which can effectively reduce road length and optimize linearity. During tunnel construction, especially the sandy clay soil section, roof fall and collapse accidents often occur. There are some shortcomings in the existing methods for handling roof fall and collapse accidents: such as insufficient advance geological forecast analysis, improper handling of roof fall, and The construction process of the shed is complicated, the construction period is long, the hole formation is difficult, and the exit hole is easy to cause collapse. [0003] Therefore, for tunnel ...

Claims

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Application Information

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IPC IPC(8): E21D11/10E21D9/10E21B21/16E21F17/18C04B28/04
CPCC04B28/04E21B21/16E21D9/10E21D11/105E21F17/18C04B14/104C04B22/142C04B14/022C04B22/04C04B22/066C04B22/064C04B22/08
Inventor 王超生谢汉昌吉亮孟鸿昌
Owner CHINA COMM NORTH ROAD & BRIDGE
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