Characteristics of Overburden Failure and Fracture Evolution in Shallow Buried Working Face with Large Mining Height

Xiuchang Shi and Jixing Zhang
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Xiuchang Shi: School of Engineering Management and Real Estate, Henan University of Economics and Law, Zhengzhou 450046, China
Jixing Zhang: Geological Survey of Jiangsu Province, Nanjing 210018, China

Sustainability, 2021, vol. 13, issue 24, 1-19

Abstract: In order to solve the issues of uncertain overburden failure height and water loss at the Daliuta coal mine, the collapse characteristics of overburden and the development height of water-conducting fractured zone were studied by using physical modeling, FLAC 3D numerical simulation, and field observation, which were used to verify each other. In order to quantitatively analyze the distribution characteristics of fracture rate of overlying rock mass in goaf, the overburden collapse image was binarized. The results showed that: (1) the failure characteristics of overburden in goaf obtained by the three research methods were roughly consistent, and the reliability of the results was high. The overburden failure height of No. 5 −2 coal with large mining height was 137.32–153 m, which was 20.8–23.2 times the mining height. (2) The repeated mining of No. 5 −2 coal intensified the further failure of the disturbed rock mass in the No. 2 −2 coal goaf. (3) In the horizontal direction of the goaf, the fracture rate of rock mass was distributed in the shape of “saddle”. In the longitudinal direction of the goaf, the rock mass fracture rate decreased in a logarithmic function with the increase of the height from the mining coal seam. Overall, the conclusions are of engineering significance for accurately adopting water resources protection mining technology and reducing mine water inrush disasters.

Keywords: overburden failure; fractured zone; similar material model; fracture rate; shallow buried coal seam; longwall mining; Daliuta coal mine (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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