Abstract
Deep mining has become the normal state of coal mining; compared with the mine with shallow buried depth, the consequent high level of in situ stress and complex distribution have brought severe threats to the stability of the stope and the surrounding rock of the roadway. In this research, taking the 121304 working face of Kouzidong Mine as the engineering background, the characteristics of mining-induced stress distribution under complex in situ stress environment in deep mining are analyzed by using on-site measurement of the original rock stress and mining stress, establishing a theoretical model centered on the middle section of the working face, and establishing large-scale numerical calculation models for different advancing directions. It was found that under deep mining conditions, the maximum stress of the original rock is 25.12 MPa, and the direction is vertical. The advanced influence range of mining stress is about 150 m, and the abutment pressure presents a three-peak distribution characteristic in front of the working face. The research results provide important theoretical guiding value for guiding the mining of coal mines with similar geological conditions.
Highlights
As the level of modern industry increases year by year, the eastern part of China needs more energy supplies [1,2,3,4,5,6]. e shallow resource was exhausted, and the deep ones begin to develop
Saeidi et al [22] analyzed the in situ stress distribution characteristics of Niobec Mine, Quebec (Canada) and the influence of in situ stress uncertainty on stability evaluation of openpit slope
Many mines use in situ stress to evaluate the stability of structure of underground and, at the same time, the interpretation of various aspects of mine data and engineering judgments are generally based on mine depth functions and methods which are determined by the value of ground stress obtained from the results of stress measure
Summary
As the level of modern industry increases year by year, the eastern part of China needs more energy supplies [1,2,3,4,5,6]. e shallow resource was exhausted, and the deep ones begin to develop. Many mines use in situ stress to evaluate the stability of structure of underground and, at the same time, the interpretation of various aspects of mine data and engineering judgments are generally based on mine depth functions and methods which are determined by the value of ground stress obtained from the results of stress measure. When the working face is in the condition of large buried depth, due to the influence of high ground stress, the mine pressure behavior will be more severe under the mining disturbance, and the creep deformation of the roadway will occur for a long time after the support [34,35,36]. 13-1 coal has been being mined at the working face, in which thickness is 5.2 m, and the comprehensive geological column chart is shown in Figure 2. e coal seam was mined by the process of mining all heights at one time. e on-site stress measurement of the working face found that the maximum principal stress is the vertical stress with a magnitude of 25.12 MPa. e intermediate principal stress is a horizontal stress with a magnitude of 21.84 MPa, and the direction is 35° west by north, and the minimum principal stress is the horizontal stress with a magnitude of 12.89 MPa, in which direction is perpendicular to the intermediate principal stress
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