Prejudgment method of stability of anchor rod-concrete invert arch heaving floor controlling structure

Abstract

The invention discloses a prejudgment method of the stability of an anchor rod-concrete invert arch heaving floor controlling structure. Through assumptions of basic conditions, a mechanical model ofthe anchor rod-concrete invert arch coupling heaving floor controlling structure is established, through mechanical analysis, the stability discriminant equation of the anchor rod-concrete invert archcoupling heaving floor controlling structure is established, and values of basic parameters of the model are obtained from field data and calculation example analysis conclusions, horizontal stress component, vertical stress component, mechanical coefficient are sequentially calculated, and finally the mechanical coefficient and the parameters of the model are substituted into the stability mechanical discriminant equation to obtain a prejudgment conclusion of whether or not a mine actually has stability after the anchor rod-concrete invert arch coupling heaving floor controlling structure isadopted. According to the prejudgment method, the prejudgment of the structure stability is accurate and comprehensive, a reliable theoretical basis for heaving floor controlling technology is provided, and the prejudgment method has great theoretical significance and practical engineering application value in ensuring the safe mining of deep resources in China and improving the safety of miningoperators.

Description

technical field [0001] The invention relates to the fields of mine support technology and rock mechanics, in particular to a method for predicting the stability of a bottom drum structure controlled by a bolt-concrete reverse arch. Background technique [0002] Floor heaving is a dynamic phenomenon that often occurs in coal mine roadways. Due to the excavation disturbance of the roadway, the stress state of the surrounding rock changes, causing the roof, floor and two sides of the surrounding rock to move into the roadway, which is manifested as an upward bulge of the floor. A large number of data show that about 2 / 3 of the deformation of the roadway is reflected in the bottom drum. The transportation, ventilation, drainage, and pedestrians in the roadway will be affected to varying degrees after the floor heaving occurs. When the floor heaving of the roadway is serious, the entire roadway will even be scrapped, which will seriously affect the safe production of the mine. I...

AI Technical Summary

Problems solved by technology

Due to the complexity of the roadway floor surrounding rock properties, failure mechanism, stress state and geological environment under high stress, the mechanical mechanism and method of controlling the bottom heave become complicated

In the case of high stress or soft bottom plate, only pay attention to the reinforcement of the bottom plate and ignore the reinforcement of the two sides of the roadway, especially when the bottom side is damaged, the components strengthening the bottom plate lose their focus on the two sides, resulting in the high stress of the bottom plate. The bottom of the roadway will be lifted or destroyed; measures such as reverse arching of cast-in-place concrete and reverse arching can strengthen the bottom plate and bottom corner of the roadway, and can restrain the swelling of the roadway bottom plate. If the bottom plate anchor is not installed, its stability is still poor, so The purpose of controlling the bottom drum of the roadway cannot be achieved ideally. Experts and scholars at home and abroad pay attention to the structure and parameter design of the anchor rod-concrete reverse arch coupling control bottom drum technology, while the stability of the anchor rod-concrete reverse arch coupling control bottom drum structure Little research has been done on the mechanism of sex mechanics

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