Prediction Method for Surface Subsidence of Coal Seam Mining in Loess Donga Based on the Probability Integration Model

Bingchao Zhao, Yaxin Guo, Xuwei Mao, Di Zhai, Defu Zhu, Yuming Huo, Zedong Sun and Jingbin Wang
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Bingchao Zhao: Energy College, Xi’an University of Science and Technology, Xi’an 710000, China
Yaxin Guo: Energy College, Xi’an University of Science and Technology, Xi’an 710000, China
Xuwei Mao: Energy College, Xi’an University of Science and Technology, Xi’an 710000, China
Di Zhai: Energy College, Xi’an University of Science and Technology, Xi’an 710000, China
Defu Zhu: State Key Laboratory of Coal Resources in Western China, Xi’an University of Science and Technology, Xi’an 710000, China
Yuming Huo: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030000, China
Zedong Sun: Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030000, China
Jingbin Wang: Energy College, Xi’an University of Science and Technology, Xi’an 710000, China

Energies, 2022, vol. 15, issue 6, 1-21

Abstract: The accurate prediction of surface subsidence is a significant foundation for the damage assessment of coal seam mining and ecological environment reclamation in loess donga. However, conventional models are very problematic, and the reliability of prediction is usually low. Therefore, we propose a method for predicting surface subsidence of coal seam mining in loess donga that is based on the probability integration model, combined with the movement principle of rock and soil layers in the respective study area, and considering the influence of slope stability and additional mining slip on mining subsidence. The feasibility of our new method was verified by a case study in the N1114 working face of the Ningtiaota coal mine (China) that is situated in an area with abundant loess dongas. The results show that slope slippage is the source of error in the prediction of subsidence in loess donga. The prediction idea of “dividing the surface of loess donga into horizontal strata area and slope sub-area, and predicting the subsidence value of the two areas, respectively” is put forward. A method for predicting the subsidence value of two regions is established. First, based on the theory of probability integral and rock formation movement, the probability integral parameters of the horizontal stratum area are determined, and the subsidence basins in the area are superimposed and calculated. Secondly, according to the slope stability and slip principle, the additional displacement of subsidence in the slope area with mining instability coefficient G cs > 0.87 is calculated. Finally, combined with the subsidence prediction results of the strata area and the slope sub-area, and the position of the slope, the accurate prediction of the surface subsidence in loess donga is realized. Our results show that the agreement between the curves predicted from our calculations and from the measured data are between 88.7–97.8%. The calculated error of the additional displacement of slope mining slip is between 1.0–9.8%. The excellent correlation between the modelled and measured data documents that our method provides, demonstrated a new efficient and valuable tool for the precise prediction of damages induced by mining of underground coal seams in loess donga.

Keywords: surface subsidence; probability integration; loess donga; superimposed calculation; additional displacement of slope mining slip (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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