Method for enabling tunnel to safely pass through shallow-buried ditch weak surrounding rock

Abstract

The invention discloses a method for enabling a tunnel to safely pass through shallow-buried ditch weak surrounding rock. The method includes the following steps that (1) stream water is blocked through damming in the upstream position of a stream above the shallow-buried weak surrounding rock, a water drainage pipe is arranged, and impervious concrete is paved at the bottom of the stream; (2) a plurality of ground surface steel pipes are arranged on the impervious concrete in the length direction of the tunnel, multiple groups of drilling holes penetrating through the shallow-buried weak surrounding rock are formed along each ground surface steel pipe, and a steel strand penetrates through one drilling hole of each group of the drilling holes; (3) after all the steel strands are locked firmly, all the drilling holes are filled with concrete, and the concrete is tamped densely; (4) advanced middle pipe sheds and advanced small ducts are arranged at the inner arch part of the tunnel, and grouting of the advanced small ducts is performed; (5) steps (1)-(4) are circulated sequentially in the construction direction of the tunnel until the tunnel passes through the shallow-buried weak surrounding rock. With the method, the construction safety when the tunnel passes through the shallow-buried weak surrounding rock is improved.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a method for enabling a tunnel to safely pass through weak surrounding rocks in a shallow buried river ditch. Background technique [0002] When the tunnel needs to pass through the shallow-buried weak surrounding rock, especially when the shallow-buried weak surrounding rock has streams, due to the complex geological conditions of the tunnel, the sandy shale is mixed with vertical calcite veins, which are thin-layered and clastic, and softened by water into mud. At present, the traditional method is to use Vb composite lining, medium pipe shed + steel arch support to pass through the above terrain, but practice has proved that the Vb composite lining, medium pipe shed + steel arch support is easier in construction. The arch frame is distorted and deformed, and the overall settlement and convergence of the initial support causes the initial support to encroach on the ...

AI Technical Summary

Problems solved by technology

At present, the traditional method is to use Vb composite lining, medium pipe shed + steel arch support to pass through the above terrain, but practice has proved that the Vb composite lining, medium pipe shed + steel arch support is easier in construction. The arch frame is twisted and deformed, and the overall settlement and convergence of the primary support cause the initial support to encroach on the limit and the arch slides, etc. The construction progress is slow, the cost increases sharply, and the safety risk is high

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