A Stability Prediction Method for Bolt-Concrete Back-arch Controlled Bottom Drum Structures

Abstract

The invention discloses a method for predicting the stability of a bottom drum structure controlled by an anchor rod-concrete reverse arch. Based on the assumption of basic conditions, the mechanical model of the anchor rod-concrete reverse arch coupling control floor drum structure is established, and the anchor rod-concrete reverse arch coupling control bass drum structure stability discriminant equation is established through mechanical analysis, which is obtained from the field data and the conclusion of the example analysis Calculate the value of the basic parameters of the model, calculate the horizontal stress component, vertical stress component, and mechanical coefficient in turn, and finally substitute the mechanical coefficient and model parameters into the stability mechanics determination equation to obtain whether the bottom drum structure is controlled by the bolt-concrete anti-arch coupling in the actual mine. Predictive conclusions with stability. The invention predicts the structural stability accurately and comprehensively, provides a reliable mechanical theoretical basis for the bottom drum treatment technology, and has great theoretical significance and practical engineering application value for ensuring the safe mining of deep resources in my country and improving the safety of mining operators.

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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