Active control method for rockburst of hard-rock tunnel

Abstract

The invention discloses an active control method for a rockburst of a hard-rock tunnel, relates to the technical field of stress of surrounding rock at rockburst release sections in underground construction, and aims to solve the problems that a conventional method for actively controlling rockburst through blasting can judge neither the accurate position or the range of a high in-situ stress region nor the accurate position of a surrounding rock structural face, is poor in blasting accuracy and low in efficiency, and cannot guarantee the construction safety. The adopted technical scheme is that by use of tunnel advanced geological prediction, construction prestress release blastholes, borehole TVs, surrounding rock structural face tandem delayed presplitting blasting and in-hole high-pressure water injection, the opening degree of the surrounding rock structural face is increased by targeted comprehensive application of the method according to the characteristics of the tunnel surrounding rock structural face; meanwhile, the extension length of the structural face is increased, and the integrity degree of surrounding rock is reduced, so that the high ground stress of surrounding rock is released, the rockburst energy is reduced or eliminated, the rockburst prevention accuracy and efficiency are improved, and the construction safety is ensured.

Description

technical field [0001] The invention relates to the technical field of releasing surrounding rock stress in rockburst sections in underground engineering, in particular to an active prevention and control method for rockburst in hard rock tunnels. Background technique [0002] There are no detailed and specific provisions in the current codes and standards to release the surrounding rock stress in the rockburst section through geological forecasting, advanced stress release holes, drilling TV, in-hole serial delay pre-splitting blasting, and in-hole high-pressure water injection comprehensive utilization methods . [0003] The invention patent application with the publication number CN 102692164 A discloses a stress unloading water injection drilling and blasting method in a structural strong rockburst area on a longitudinal structural surface. The steps are as follows: a. Drilling a group of evenly and symmetrically arranged blasting b. Clean the excavation surface with cl...

AI Technical Summary

Problems solved by technology

[0007] The invention provides an active prevention and control method for rockbursts in hard rock tunnels, which solves the problem that the existing method of actively controlling rockbursts through blasting cannot judge the exact location and range of high ground stress areas, cannot judge the exact location of surrounding rock structural surfaces, and has poor blasting accuracy and efficiency. Not high, and the problem that construction safety cannot be guaranteed

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