Anti-rockburst supporting method in tunnel and anti-rockburst supporting system in tunnel

Abstract

The invention relates to the technical field of engineering, such as transportation, water conservancy, mines and the like, and provides an anti-rockburst supporting method in tunnel and an anti-rockburst supporting system in tunnel. The anti-rockburst supporting method in tunnel comprises the following steps: forming a shotcrete layer, which has a plurality of grooves, on the surface of a tunnel of surrounding rock; inserting a plurality of prestressed energy-releasing anchor rods in a radial direction of the surrounding rock; controlling the prestressed energy-releasing anchor rods to actively support the surrounding rock, wherein the prestressed energy-releasing anchor rods sideslip and move for a certain distance according to the anti-rockburst needs when the stress of the rod bodys of prestressed energy-releasing anchor rods reaches a preset stress value. The anti-rockburst supporting method in tunnel is scientific and reasonable, can effectively prevent or reduce the occurrence of a rock burst. The anti-rockburst supporting system in tunnel comprises the surrounding rock, the shotcrete layer and a plurality of prestressed energy-releasing anchor rods, a plurality of grooves are formed in the shotcrete layer at intervals, one end of each prestressed energy-releasing anchor rod is embedded in the surrounding rock in the radial direction of the surrounding rock, the other end of each prestressed energy-releasing anchor rod is located at the shotcrete layer. The supporting system can ensure the stability and safety of the tunnel under the condition of rock burst.

Description

technical field [0001] The invention relates to the technical fields of engineering such as traffic, water conservancy, and mining, and in particular relates to a tunnel rockburst prevention support method and a tunnel rockburst prevention support system. Background technique [0002] Rockburst is a dynamic failure phenomenon in which the deformation energy stored in the surrounding rock is suddenly released after the radial stress is relieved and the tangential stress increases due to the tunnel excavation in the hard surrounding rock under high ground stress. Up to now, the prevention and control of rockbursts at home and abroad, especially the design of support measures, mostly adopt the concept of passive protection. The so-called passive protection means relying on the strength of the support structure itself to resist possible rockburst disasters. The support measures under this prevention concept cannot apply the radial stress of the cave wall in time to improve the s...

AI Technical Summary

Problems solved by technology

At the same time, the release of deformation energy in the rock body cannot be realized during the rockburst prevention process, resulting in poor rockburst prevention effect

So far, no matter in the underground engineering in the field of transportation, water conservancy and mining, there is no mention of quickly applying radial restraint force to the wall of the cave and when the force on the rod body reaches a set value, the bolt will start to slide for a certain distance , and the sliding distance and the constraint force applied to the cave wall can be set according to the rockburst prevention system and method

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