Characteristics and Formation Mechanism of Surface Residual Deformation above Longwall Abandoned Goaf

Erhu Bai, Xueyi Li, Wenbing Guo, Yi Tan (), Mingjie Guo, Peng Wen and Zhibao Ma
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Erhu Bai: Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi’an University of Science and Technology, Xi’an 710054, China
Xueyi Li: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
Wenbing Guo: Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi’an University of Science and Technology, Xi’an 710054, China
Yi Tan: Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi’an University of Science and Technology, Xi’an 710054, China
Mingjie Guo: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
Peng Wen: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
Zhibao Ma: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China

Sustainability, 2022, vol. 14, issue 23, 1-16

Abstract: With the rapid development of social economy in China, the contradiction between the wide distribution of abandoned goaf and the shortage of land for engineering construction is becoming increasingly prominent. The effective utilization of coal mining subsidence areas has become an effective measure to alleviate the poverty of construction land in mining areas and promote the green transformation of mining cities. The key to the scientific utilization of abandoned goaf is the prevention and control of surface residual deformation, which depends on the formation mechanism of surface residual deformation. Based on the regularity of mining-induced surface movement and deformation under different mining sizes, it is concluded that the full mining degree of working face is the primary condition for entering the surface recession period. The trapezoidal and periodic forward movement characteristics of mining-induced overburden destruction are analyzed. The regularity of upward transmission of mining-induced fissures with overburden destruction is clarified. The influencing factors of surface residual deformation are equivalent to the influencing factors of overburden structure and caved zone. The deformation characteristics of broken rock in the caved zone under different conditions (particle size, gradation, and water content) are analyzed. It is concluded that the surface residual subsidence near the boundary of the goaf is more significant than that in the middle of the goaf. It is revealed that the overburden structure at the boundary of the goaf and the re-compaction of the caved zone is the mechanism of surface residual deformation. The characteristics of surface residual deformation in abandoned goaf have been verified by field measurement, and it is pointed out that the surface residual deformation in abandoned goaf has long-term characteristics, which provides a theoretical basis for accurate prediction of surface residual deformation and rational utilization of abandoned goaf.

Keywords: abandoned goaf; surface residual deformation; formation mechanism; overburden structure (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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