Support method of weak and broken surrounding rock tunnel

Abstract

The invention discloses a support method of a weak and broken surrounding rock tunnel and belongs to the field of underground engineering support. According to the method, the excavation is carried out according to the cross section shape of the tunnel, concrete is jet at the surrounding rock surface of the excavated tunnel for sealing surrounding rock cracks, secondly, anchor rods are constructed at the arch wall position, small guide pipes are applied to the top and the side wall foot part for grouting, the end part of each anchor rod is hung and provided with steel bar net sheets, then, steel pipes are applied for restraining concrete arch frames, the arch frames are arranged at intervals in the axial direction of the tunnel, a steel bar truss is erected between two adjacent arch frames, and the concrete is sprayed for twice. The support method has the advantages that a support system can be enabled to realize the better surface protection performance, the support system has the tamper force with mercy, higher support resistance can be realized, the proper deformation yielding can also be realized, and the support method is suitable for the weak and broken surrounding rock tunnel.

Description

technical field [0001] The invention relates to a support method for tunnels with weak and broken surrounding rocks, belonging to the field of underground engineering support. It is mainly suitable for the support of tunnels with weak and broken surrounding rocks, that is, the support of tunnels with deep buried soft rocks and broken rocks with large deformation. Background technique [0002] At present, my country's traffic construction has developed to the western mountains and areas with complex geological conditions. More and more tunnels are being built in high-stress weak surrounding rocks and broken and large-deformed surrounding rocks. The use of effective support technology is the key to ensuring the stability of surrounding rocks and safe production. [0003] For deep-buried high-stress complex geological tunnel projects, due to the softening of the rock or the large deformation of the surrounding rock under the high ground stress environment, the conventional bolt...

AI Technical Summary

Problems solved by technology

[0003] For deep-buried high-stress complex geological tunnel projects, due to the softening of the rock or the large deformation of the surrounding rock under the high ground stress environment, the conventional bolt support, sprayed anchor net support, and bolt plus arch composite support methods cannot provide Sufficient support resistance to effectively resist tunnel convergence and deformation, often occurs when the initial lining is squeezed and cracked after support, tunnel convergence increases, and the surrounding rock cannot be stabilized, which seriously affects the construction progress

In production practice, the above-mentioned conventional support methods are often used repeatedly, and even multi-layer arch construction is used for lining. Although certain effects are obtained, the investment is large, the support cost is high, the progress is slow, and it also takes up a large building space

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