A multi-level support technology and monitoring method for roadway with large impact rock pressure

Abstract

The invention discloses a multi-level support technology and monitoring method for a roadway with large impact rock pressure. Starting from the initial support of the roadway, a support system with the characteristics of flexibility, dynamics and fault tolerance of multiple support units is adopted. The rock is the bearing body, changing the previous point of view that the support can only be passively loaded, and improving the mechanical state of the surrounding rock by various means, so that the surrounding rock in the state of discrete anisotropy can be fully consolidated from loose and sublimated from broken, loose and weak to high A homogeneous and homogeneous new surrounding rock mass with strong density. The shallow part of the surrounding rock changes from a low potential energy zone to a high stress potential energy zone, achieving the goal of alleviating the high stress transmission or changing speed in the deep part, and continuously improving the strength of the surrounding rock itself. Basically, the loose surrounding rock circle after excavation of the roadway is changed from a loading body to a real bearing body. By doing a good job of daily mine pressure monitoring and monitoring during the roadway construction process and after the construction, the roadway deformation and The working state of the anchor rod ensures the safety of the roadway support.

Description

technical field [0001] The invention relates to the technical field of mine roadway support, in particular to a multi-level support technology and monitoring method. Background technique [0002] With the increase of mining depth in the mining area, the geological conditions of the mine have become more and more complex, and the difficult factors affecting the mine construction have appeared from many aspects, especially the faults of different sizes cut, disconnected and separated the mine field, which brought great difficulties to mine mining. In particular, the fault causes the rocks in the fault section to be broken and the difference in stress increases. At the same time, it often communicates the water in the aquifer in the roof and floor of the coal seam to flow into the fault section, making the broken rock mass in the fault section muddy and rheological, and even forming a water outlet channel. , which brings many difficulties to the normal construction of the mine....

AI Technical Summary

Problems solved by technology

[0002] With the increase of mining depth in the mining area, the geological conditions of the mine have become more and more complex, and the difficult factors affecting the mine construction have appeared from many aspects, especially the faults of different sizes cut, disconnected and separated the mine field, which brought great difficulties to mine mining. In particular, the fault causes the rocks in the fault section to be broken and the difference in stress increases. At the same time, it often communicates the water in the aquifer in the roof and floor of the coal seam to flow into the fault section, making the broken rock mass in the fault section muddy and rheological, and even forming a water outlet channel. , which brings many difficulties to the normal construction of the mine. However, due to the needs of production capacity and mine field layout, the mine must pass through these faults, so as to ensure safe passage of roadway engineering under the action of high pressurized water, mudification, fault fracture zones and asymmetric pressure. It is an important and complicated technical problem in the underground engineering in the world today to control the stability of the surrounding rock through construction, support and post-support. The fault zone under the condition of high pressure water, mudification and asymmetric stress, the traditional The supporting concept, such as steel metal frame shed, ultra-high-strength anchor rod, dense anchor cable and other strong support methods can no longer be adapted, and the roadway under high pressure water, fault fracture zone, muddy and asymmetric stress conditions, generally It has the characteristics of buried deep and high ground stress, mud rheology, extremely soft and broken, easy to fall, etc. After the roadway support is completed, it will still undergo multiple deformations

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