Abstract
It is of great significance to study the reasonable position of mining roadway under strip coal pillar for increasing the stability of mining roadway, reducing the waste of resources, and realizing the safety production of working face. Based on the research background of the working face under the strip coal pillar in Jinqiao Coal Mine of Jining, Shandong Province, through theoretical analysis, similar material simulation experiment, and numerical simulation experiment, the stress distribution law, plastic failure range, and rationality of coal pillar setting in different width sections are systematically studied. Finally, the tailentry of working face is determined at the position of 5 m from the bottom of strip coal pillar to 1308 goaf. During the mining period of 1310 working face, the peak value of side abutment pressure is at the position of 3∼4 m; beyond 25 m in front of the coal wall, the deformation of the surrounding rock on the tailentry surface is small. After entering the advanced support section, the deformation of the two sides is mainly longitudinal crack expansion and local shallow small flakes; however, the roof is complete and stable. Therefore, the selection of tailentry location and coal pillar width has played a good role. The research results of this study can provide some reference for similar mine with similar geological and production technical conditions.
Highlights
With the development of coal industry for many years, there are few high-quality energy resources left in the eastern part of China, and the mining of deep resources faces many problems such as “three high and one disturbance,” complex geological environment, and deterioration of mining environment. erefore, the safe and efficient mining of high-quality resources under pressure in shallow areas is an urgent problem [1, 2]
When strip coal pillar is mined in fully mechanized top coal caving face, problems such as uneven roof subsidence and abnormal stress distribution of coal body will occur. ese abnormal phenomena affect the selection of tailentry position and the setting of section coal pillar
Wang et al [27,28,29,30,31,32] studied the reasonable coal pillar width under the corresponding specific geological conditions by means of numerical simulation, similar material simulation experiment, and theoretical analysis and carried out industrial experiments and field measurements to prove the stability of the reserved coal pillar width
Summary
With the development of coal industry for many years, there are few high-quality energy resources left in the eastern part of China, and the mining of deep resources faces many problems such as “three high and one disturbance,” complex geological environment, and deterioration of mining environment. erefore, the safe and efficient mining of high-quality resources under pressure in shallow areas is an urgent problem [1, 2]. Erefore, it is of great significance to study the reasonable tailentry position and section pillar width under the strip coal pillar for the safe and efficient mining of the working face [9, 10]. Wang et al [27,28,29,30,31,32] studied the reasonable coal pillar width under the corresponding specific geological conditions by means of numerical simulation, similar material simulation experiment, and theoretical analysis and carried out industrial experiments and field measurements to prove the stability of the reserved coal pillar width It provides a great reference for the design of section coal pillar under similar conditions. The reasonable position of the tailentry and the width of the section coal pillar are deeply studied to realize the working face under the strip coal pillar safe and efficient mining
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