Rockburst microseismic monitoring method for long-distance TBM tunnel under soft and hard interbedded geological conditions

Abstract

The invention discloses a rockburst microseismic monitoring method for a long-distance TBM tunnel under a soft and hard interbedded geological condition. The method comprises: differentiating hard rock areas and soft rock areas in the tunnel through geological exploration, drilling and imaging hard rock boreholes in the hard rock areas, and arranging microseismic sensors in the hard rock boreholesof the complete hard rock sections in the hard rock areas; installing a microseismic monitoring system on the TBM, and communicating with the rockburst microseismic monitoring center outside the tunnel through a wireless bridge group. According to the rockburst microseismic monitoring method for a long-distance TBM tunnel under a soft and hard interbedded geological condition, the problems of installation and recovery of the microseismic sensors under a soft and hard interbedded geological condition are solved, the influence of the soft rock areas on the reception of the microseismic monitoring signals is avoided, the difficulty that the line of long-distance tunnel signal transmission is easily damaged is overcome, the quality and continuity of the rockburst microseismic monitoring are ensured, and the foundation for the accurate warning of the rockburst disaster is laid. The invention can be used for the safe excavation of deep buried long-distance TBM tunnel engineering under a complex geological condition.

Description

technical field [0001] The invention relates to the field of microseismic monitoring, and more particularly relates to a method for monitoring microseismic rockbursts in long-distance TBM tunnels under soft and hard interbedded geological conditions. technical background [0002] Rockburst is a strong surrounding rock damage caused by the sudden release of high strain energy accumulated in the rock mass during the construction of high-stress underground engineering. It is sudden, violent and random, causing great damage to construction personnel and mechanical equipment. harm. And complex geological conditions are an important factor affecting rockbursts, which can easily induce more dangerous strong or even extremely strong rockbursts, seriously endangering construction safety. [0003] Microseismic monitoring technology is an important monitoring method for rockbursts. It has been widely used in rockburst monitoring in tunnels, mines, underground laboratories and other pr...

AI Technical Summary

Problems solved by technology

[0004] Microseismic monitoring methods have an important impact on the ability to capture microfractures in rock mass, which in turn affects the effect of rockburst early warning

So far, there has been no report on rockburst monitoring methods for long-distance TBM tunnels under complex soft-hard interbedded geological conditions

Research results related to tunnel microseismic monitoring methods, such as the utility model "Tunnel boring machine TBM tunnel microseismic monitoring structure", patent number 201721434732.; utility model "Microseismic monitoring sensor arrangement structure during TBM excavation process of deep buried long tunnel", patent number 201120380491.9 ; Invented "A Tunnel Microseismic Monitoring Sensor Arrangement and Connection Method with Data Acquisition Instrument", Patent No. 201410014854.5; Invented "A Layered Excavation and Deep Buried Hard Rock Tunnel Microseismic Monitoring Sensor Arrangement Method", Patent No. 201410015118.1; Microseismic monitoring methods have been invented and optimized, but they have not fully considered the impact of tunnel geology and lithology and long distances on microseismic monitoring

First of all, soft and hard geological conditions and rock fracture properties are not distinguished. If the microseismic sensor is placed in soft rock, the soft rock deformation and hole collapse will make the microseismic sensor difficult to install and cannot be recovered; The signal acquisition quality of the sensor is poor, and even the signal generated in the rock body cannot be captured

Secondly, in the process of long-distance TBM tunnel monitoring, the monitoring system and lines need to continuously follow the fast movement of the TBM, which will bring a huge workload

In addition, if the monitoring line is not moved in time or the construction in multiple places in the long-distance TBM tunnel is easy to cause damage to the line, affecting the continuous monitoring of rockbursts

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