Processing method for extremely-high geostress soft rock tunnel arch wall lining cracking damage

Abstract

The invention discloses a processing method for extremely-high geostress soft rock tunnel arch wall lining cracking damage. The method comprises the following steps that 1, the boundary location between a lining dismantling segment and a lining non-dismantling segment is reinforced; 2, radial grouting surrounding rock reinforcing are conducted on an arch wall lining, and then temporary hole slag backfilling is conducted; 3, an original upper secondary lining and an original upper primary supporting structure are statically dismantled; 4, the upper primary supporting structure is constructed; 5, an original middle secondary lining and an original middle primary supporting structure are statically dismantled; 6, the middle primary supporting structure is constructed; 7, an original lower secondary lining and an original lower primary supporting structure are statically dismantled; 8, the lower primary supporting structure is constructed; 9, an arch wall secondary lining structure is constructed; 10, the steps from 3 to 9 are repeatedly conducted till extremely-high geostress soft rock tunnel arch wall lining cracking damage segment processing is completed. According to the method, the problem that when the lining of an extremely-high geostress soft rock tunnel arch wall lining cracking damage segment is dismantled and replaced, large deformation of surrounding rocks is prone to occur is effectively solved, and the construction safety of lining dismantling and replacing of the extremely-high geostress soft rock tunnel arch wall lining cracking damage segment is guaranteed.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of tunnel disease treatment, in particular to a treatment method for cracking and damage of arch wall lining of soft rock tunnel with extremely high ground stress. [0003] 【Background technique】 [0004] Under the extremely high ground stress soft rock environment, due to the combined effect of high ground stress and weak surrounding rock, the support system of the built tunnel often fails. In order to ensure the structural safety of the tunnel, it is necessary to dismantle the support structure of the tunnel lining cracked section. For processing. How to ensure the safety of the support structure dismantling and replacement of the damaged section of the tunnel lining is the focus and difficulty of tunnel cracking and damage treatment. At present, for general tunnel lining diseases or defects caused by quality problems, such as insufficient lining thickness, large voids, or cutting corners, etc., t...

AI Technical Summary

Problems solved by technology

At present, for general tunnel lining diseases or defects caused by quality problems, such as insufficient lining thickness, large voids, or cutting corners, etc., the method of one-time static demolition of the whole ring or controlled blasting demolition is mainly used to deal with it, while If the lining of the cracked and damaged section of the soft rock tunnel with extremely high ground stress is removed in one go, the surrounding rock is likely to undergo large deformation or even collapse, which seriously threatens construction safety.

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