Surrounding rock stability control method for deep ultra-large section dense chamber group

Abstract

The invention relates to a surrounding rock stability control method for a deep ultra-large section dense chamber group. The technical problem that existing deep ultra-large section chamber surrounding rock is unstable is solved. The method comprises the following steps that geological conditions of coal and rock masses are analyzed, and physical and mechanical parameters of the coal and rock masses are measured; support parameters are determined according to the chamber surrounding rock deformation rule and the chamber surrounding rock stability mechanism under the high stress condition; theposition and the size of an ultra-large section chamber are determined according to the analysis result and the surrounding rock physical and mechanical parameters; tunneling is performed in a drilling and blasting mode; according to the support parameters, a combined supporting mode of a metal net, anchor rods, anchor cables and sprayed concrete is adopted for supporting the arch-shaped ultra-large section of the chamber; and the coal seam is mined, and gangue generated in the post-mining area is used for backfilling into the goaf of the pre-mining area. According to the method, the construction process of the deep ultra-large section chamber is perfected, the supporting strength is improved, the deformation of the surrounding rock of the chamber is controlled to be stabilized within an allowable range for a long time, later maintenance of the chamber is reduced, secondary supporting is avoided, and meanwhile green mining is achieved.

Description

technical field [0001] The invention relates to the technical field of deep large-section surrounding rock control, in particular to a method for controlling the stability of surrounding rock stability of dense chamber groups with super-large deep sections. Background technique [0002] With the deep mining of coal resources, the ground stress increases rapidly, and a large number of chambers with difficult support appear. The continuous deterioration of geological conditions, changes in the stress environment of the rock mass and the resulting variation in the mechanical properties of the rock mass, rock mass structure, strength, deformation and other characteristics have resulted in an increase in broken rock mass, increased water inflow, and increased ground temperature. High, deteriorating operating environment, difficult maintenance of chambers, increased costs, and difficulty in ensuring safety, etc., have also led to an increase in major disasters and accidents in dee...

AI Technical Summary

Problems solved by technology

The continuous deterioration of geological conditions, changes in the stress environment of the rock mass and the resulting variation in the mechanical properties of the rock mass, rock mass structure, strength, deformation and other characteristics have resulted in an increase in broken rock mass, increased water inflow, and increased ground temperature. A series of problems such as high temperature, deteriorating working environment, difficulty in chamber maintenance, high cost, and difficulty in ensuring safety have also led to an increase in major disasters and accidents in deep resource mining.

Images