A rockburst microseismic monitoring method for long-distance TBM tunnels under soft-hard interbedded geological conditions

Abstract

The invention discloses a long-distance TBM tunnel rockburst microseismic monitoring method under soft-hard interbedded geological conditions, which distinguishes the hard rock area and soft rock area in the tunnel through geological exploration, and drills hard rock holes in the hard rock area Camera, place the microseismic sensor in the hard rock drilling of the complete hard rock section in the hard rock area; install the microseismic monitoring system on the TBM, and communicate with the rockburst microseismic monitoring center outside the tunnel through the wireless network bridge group. The present invention better solves the problem of the installation and recovery of the microseismic sensor under soft and hard interbedded geological conditions, avoids the influence of soft rock areas on the reception of microseismic monitoring signals, overcomes the difficulty that the lines of long-distance tunnel signal transmission are easily damaged, and ensures The quality and continuity of explosion and microseismic monitoring lay the foundation for accurate early warning of rockburst disasters. The invention can be used for safe excavation of deep-buried long-distance TBM tunnel engineering under complex geological conditions.

Description

technical field [0001] The invention relates to the field of microseismic monitoring, and more particularly relates to a microseismic monitoring method for rock burst in a long-distance TBM tunnel under the geological conditions of soft and hard interbeds. [0002] technical background [0003] Rockburst is a strong surrounding rock damage caused by the sudden release of high strain energy accumulated in the rock body during the construction of high-stress underground engineering. harm. Complex geological conditions are an important factor affecting rockbursts, which are easy to induce more dangerous strong or even extremely strong rockbursts, which seriously endanger construction safety. [0004] Microseismic monitoring technology is an important monitoring method for rockburst. It has been widely used in rockburst monitoring in tunnels, mines, underground laboratories and other projects in Africa, Australia, the United States, Canada, and China, and a series of research re...

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Problems solved by technology

[0005] 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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