A construction method for stabilizing interlayer rock in tunnels with weak surrounding rock and small clear distance

Abstract

The invention relates to the construction method of a weak surrounding rock small-distance tunnel stable mid-adjacent rock. After a tunnel is excavated, a dark hole mid-adjacent rock is uniformly provided with the three-way reinforcements of advanced grouting ducts so that the rock is in a three-way compressed state and the integrity of the mid-adjacent rock is increased. During tunnel construction, a first row hole tunnel face exceeds 20-50m of front and rear row hole tunnel faces, the rear row hole tunnel face and an inverted arch construction process are located between a first row hole inverted arch and secondary lining and are located at a first row hole primary supporting ring segment, and secondary lining concrete cracking caused by an additional stress generated during the excavation process of a rear row hole can be effectively prevented. Through carrying out pre-reinforcement and secondary reinforcement on the mid-adjacent rock, tunneling disease phenomena of collapse, cracking, rheology and the like are effectively prevented, the constructed temporary inverted arch and later construction cost are reduced, a construction speed is improved, a construction period is shortened, and simultaneously, the safety of a total construction period and later operation can be ensured, high practicability is possessed, and the method is worth promoting.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to a construction method for stabilizing intermediate rock in a tunnel with weak surrounding rock and a small clear distance. Background technique [0002] There is an old saying: "If you want to get rich, build roads first", which reveals the direct impact relationship between economic development and traffic level. At present, with the increasing economic level and the development needs of traffic, the roads connecting the north and the south of the river Bridge engineering is also developing rapidly, and new technologies are constantly emerging. Among them, there are also many tunnel projects with small clear distances constructed in the mountains in order to shorten the distance. If it is reasonable, there will be tunnel diseases such as collapse, cracking and rheology, which will affect the construction speed and construction period, and even endanger lif...

AI Technical Summary

Problems solved by technology

[0002] There is an old saying: "If you want to get rich, build roads first", which reveals the direct impact relationship between economic development and traffic level. At present, with the increasing economic level and the development needs of traffic, the roads connecting the north and the south of the river Bridge engineering is also developing rapidly, and new technologies are constantly emerging. Among them, there are also many tunnel projects with small clear distances constructed in the mountains in order to shorten the distance. Reasonable, there will be tunnel defects such as collapse, cracking and rheology, which will affect the construction speed and construction period, and even endanger life safety in serious cases, causing major economic losses

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