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Geomechanics and Engineering Volume 22, Number 6, September25 2020 , pages 541-552 DOI: https://doi.org/10.12989/gae.2020.22.6.541 |
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The gob-side entry retaining with the high-water filling material in Xin\'an Coal Mine |
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Tan Li, Guangbo Chen, Zhongcheng Qin, Qinghai Li, Bin Cao and Yongle Liu
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| Abstract | ||
| With the increasing tension of current coal resources and the increasing depth of coal mining, the gob-side entry retaining technology has become a preferred coal mining method in underground coal mines. Among them, the technology of the gob-side entry retaining with the high-water filling material can not only improve the recovery rate of coal resources, but also reduce the amount of roadway excavation. In this paper, based on the characteristics of the high-water filling material, the technological process of gob-side entry retaining with the high-water filling material is introduced. The early and late stress states of the filling body formed by the high-water filling materials are analyzed and studied. Taking the 8th floor No.3 working face of Xin\'an coal mine as engineering background, the stress and displacement of surrounding rock of roadway with different filling body width are analyzed through the FLAC3D numerical simulation software. As the filling body width increases, the supporting ability of the filling body increases and the deformation of the surrounding rock decreases. According to the theoretical calculation and numerical simulation of the filling body width, the filling body width is finally determined to be 3.5m. Through the field observation, the deformation of the surrounding rock of the roadway is within the reasonable range. It is concluded that the gob-side entry retaining with the high-water filling material can control the deformation of the surrounding rock, which provides a reference for gob-side entry retaining technology with similar geological conditions. | ||
| Key Words | ||
| gob-side entry retaining; high-water filling material; filling body; numerical simulation; field observation | ||
| Address | ||
| Tan Li: 1.) Mining Research Institute, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia, 014010, China 2.) College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao, Shandong, 266590, China Guangbo Chen: Mining Research Institute, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia, 014010, China Zhongcheng Qin: 1.) College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao, Shandong, 266590, China 2.) National Demonstration Center for Experimental Mining Engineering Education, Shandong University of Science and Technology, Qingdao, Shandong, 266590, China Qinghai Li, Bin Cao and Yongle Liu: College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao, Shandong, 266590, China | ||