Geomechanics and Engineering

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Stability analysis of settled goaf with two-layer coal seams under building load-A case study in China

  • Yao, Lu (State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology) ;
  • Ning, Jiang (State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology) ;
  • Changxiang, Wang (College of Safety Science and Engineering, Anhui University of Science and Technology) ;
  • Meng, Zhang (College of Safety Science and Engineering, Anhui University of Science and Technology) ;
  • Dezhi, Kong (Wenzhou Medical University) ;
  • Haiyang, Pan (State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology)
  • Received : 2022.06.22
  • Accepted : 2023.01.12
  • Published : 2023.02.10
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Abstract

Through qualitative analysis and quantitative analysis, the contradictory conclusions about the stability of the settled goaf with two-layer coal seams subject to building load were obtained. Therefore, it is necessary to combine the additional stress method and numerical simulation to further analyze the foundation stability. Through borehole analysis and empirical formula analogy, the height of water-conducting fracture zone in No.4 coal and No.9 coal were obtained, providing the calculation range of water-conducting fracture zone for numerical simulation. To ensure the accuracy of the elastic modulus of broken gangue, the stress-strain curve were obtained by broken gangue compression test in dried state of No.4 coal seam and in soaking state of No.9 coal seam. To ensure the rationality of the numerical simulation results, the actual measured subsidence data were retrieved by numerical simulation. FISH language was used to analyze the maximum building load on the surface and determine the influence depth of building load on the foundation. The critical building load was 0.16 MPa of No.4 settled goaf and was 1.6 MPa of No.9 settled goaf. The additional stress affected the water-conducting fracture zone obviously, resulted in the subsidence of water-conducting fracture zone was greater than that of bending subsidence zone. In this paper, the additional stress method was analyzed by numerical simulation method, which can provide a new analysis method for the treatment and utilization of the settled goaf.

Keywords

Acknowledgement

This paper is supported by Anhui Provincial Key Research and Development Project (2022m07020006), Anhui Provincial Natural Science Foundation (2208085ME124), Shandong Provincial Natural Science Foundation (ZR2020QE102, ZR2019BEE013); SDUST Research Fund (2019TDJH101); Shandong postgraduate education quality improvement plan project (No. SDYJG19062); Research project of undergraduate teaching reform in Shandong Province (No. P2020013); National Natural Science Foundation of China (52004146,51974178, 52074169, 52174159); China Postdoctoral Science Foundation (2022M713386) ; the Research Fund of Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education (KLDCRM202102) and the 2020 Joint Fund for the Project of the State Key Laboratory of Coal Resources and Safe Mining-Outstanding Young Scientists Program of Beijing Higher Education Institutions (SKLCRSM20LH04).

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