Construction method used after tunnel integral type collapse

Abstract

The invention provides a construction method used for tunnel integral type collapse. A collapsed tunnel is divided into two sections in the tunneling direction, the first section is an impacting area, and the second section is a collapsing area; a first support is complete in the impacting area, only a tunnel face collapsing part is subjected to treatment, and tunnel surrounding rocks are not subjected to treatment; and part of a first support in the collapsing area is damaged, and tunnel surrounding rocks and a tunnel face collapsing part are both subjected to treatment. Compared with the prior art, the construction method used for tunnel integral type collapse has the beneficial effects that (1) advanced small guiding pipes at the top of a tunnel and I-shaped steel arching frames are ingeniously combined, so that the advanced small guiding pipes form a structure similar to a pipe shed, and the supporting capacity is strengthened; and (2) collapsing part small guiding pipes are densely hit on tunnel faces to enable the tunnel face collapsing parts to be concreted, the collapsing part small guiding pipes and surrounding rock soil form a stone body, and thus the capacity of resisting the tunnel top collapsing load and impacting load is strengthened.

Description

A construction method after integral collapse of tunnel technical field The invention relates to a construction method for tunnel engineering. Background technique The length of diversion tunnels for thermal power units in power plants is generally more than several thousand meters long. The tunnel body structure is designed in the shape of a 2.5m×3m city gate, and the entrance and exit sections are excavated at the same time. The groundwater activity in culverts is generally weak, but due to faults, fault water may exist, and water inrush may occur in some sections of the cave. Moreover, due to the large permeability coefficient and strong permeability of the surrounding rock, short-term water seepage and gushing may occur in rainy seasons. If the surrounding rock is Quaternary alluvial, alluvial cohesive soil with gravel and other loose accumulations, there will be fault zones in the underlying bedrock, intersecting the tunnel line at a large angle. The surrounding ro...

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Problems solved by technology

Pipe sheds are more expensive

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