Research on the Height of the Water-Conducting Fracture Zone in Fully Mechanized Top Coal Caving Face under Combined-Strata Structure

Donghai Jiang, Yinfeng Tang (), Wanpeng Huang, Keke Hou, Yi Luo and Jiangwei Liu
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Donghai Jiang: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Yinfeng Tang: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Wanpeng Huang: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Keke Hou: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Yi Luo: Shanxi Gaohe Energy Co., Ltd., Changzhi 046000, China
Jiangwei Liu: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China

Sustainability, 2022, vol. 14, issue 21, 1-20

Abstract: In order to study the development height of the water-conducting fracture zone in a fully mechanized top coal caving face. The E2311 working face of Gaohe Coal Mine was chosen as the research object, and the combined-strata structure and the rock layer synergistic movement mechanism were determined by combining engineering geological investigation and theoretical analysis. The height of the water-conducting fracture zone at the working face was calculated based on the combined-strata structure, and then the theoretical results were verified by numerical simulation and field measurement. The results show that after the coal seam is extracted from the working face, the movement of the overlying rock layers is in the form of bending and sinking movement of the rock layer group as a unit. Each rock layer group is controlled by a supportive lower layer with greater thickness and strength, driving the upper layers of weaker rock layers to synchronize and coordinate the movement; the sinking curvature is the same, after the lowermost support layer is bent and broken, its overlying weaker rock layers will move and break at the same time. The height of the water-conducting fracture zone of the working face were obtained by theoretical calculation, numerical simulation, and field measurements, which are 83.82 m, 84.3 m, and 86.6 m, respectively. The results are nearly consistent, thus the prediction of the height of the water-conducting fracture zone under the combined-strata structure is more accurate.

Keywords: water-conducting fracture zone; combined-strata structure; synergistic movement mechanism of the rock groups; stratum’s tensile ratio; numerical simulation; field test (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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