A tunnel construction method in strong rockburst section in high altitude area

Abstract

The invention discloses a tunnel construction method in a high-altitude region with severe rockburst, which includes: S1, providing an overall advanced geological report; S2, providing an on-site prediction report; S3, advanced support construction; S4, advanced stress release; S5, Tunnel excavation; S6, drainage treatment for water gushing; S7, initial support construction; S8, after the initial support is completed, grouting reinforcement is performed on the predicted rockburst occurrence site; S9, laying a waterproof layer on the surface of steel fiber concrete layer, and use geotextile protection; then carry out inverted arch and second lining construction; the tunnel construction method of the strong rockburst section in the high altitude area of ​​the present invention can predict the possibility of rockburst in advance and take corresponding measures to reduce or avoid the risk of rockburst In order to ensure the safety of construction personnel and mechanical equipment, and to ensure the process cycle time and construction progress.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a tunnel construction method in areas with strong rockbursts in high-altitude areas. Background technique [0002] With the vigorous development of national transportation construction, with the continuous development of my country's construction industry and the continuous innovation of construction technology, there are more and more rock operations such as tunnels. With the increase of rock mass depth, the geological environment is more complex and the ground stress is more severe. High, the engineering geological disaster rockburst induced by excavation is more prominent and serious. Rockburst is a phenomenon in which the hard and brittle surrounding rock is affected by the differentiation and concentration of ground stress during the excavation of underground engineering, causing the elastic strain energy stored in the rock mass to be released suddenly, resulting in burstin...

AI Technical Summary

Problems solved by technology

[0003] Rock bursts have a great impact on tunnel construction. When they occur, they may cause casualties and losses to personnel and machinery. Operators and mechanical equipment on the face of the tunnel must be evacuated, and the uncertainty of rock bursts can easily lead to anxiety among construction workers. At the same time, the blast pit or over-excavation part formed after the rockburst must be backfilled and sprayed and anchored smooth to eliminate hidden dangers; in summary, on the one hand, rockburst may cause personnel or mechanical losses and high construction risks, and on the other hand may increase Engineering cost, affecting process cycle time and construction schedule