Construction method for tunnel in violent rockburst section in high-altitude area

Abstract

The invention discloses a construction method for a tunnel in a violent rockburst section in a high-altitude area. The construction method includes the steps: S1, providing an overall advanced geological report; S2, providing an on-site prediction report; S3, carrying out advanced support construction; S4, carrying out advanced stress relief; S5, carrying out tunnel excavation; S6, carrying out drainage treatment for water burst; S7, carrying out initial support construction; S8, after initial support construction is completed, carrying out grouting reinforcement on a predicted rockburst occurrence location; and S9, laying a waterproof layer on the surface of steel fiber reinforced concrete, using geotextile for protection, and then carrying out inverted arch and second lining construction. By means of the construction method for the tunnel in the violent rockburst section in the high-altitude area, the probability of occurrence of rockburst can be predicted in advance, and corresponding measures can be taken to reduce or avoid the occurrence of rockburst to ensure the safety of construction personnel and mechanical equipment and ensure the process cycle time and the 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