Investigation of the Effectiveness of a New Backfilling Method: “Multi-Arch Pier-Column”

Guangzheng Xu, Kegong Fan, Xuehui Li (), Xinshuai Shi (), Jianguo Ning, Jun Wang, Guoqing Sun and Jingyu Chang
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Guangzheng Xu: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Kegong Fan: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Xuehui Li: College of Transportation, Shandong University of Science and Technology, Qingdao 266590, China
Xinshuai Shi: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Jianguo Ning: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Jun Wang: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Guoqing Sun: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Jingyu Chang: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China

Energies, 2022, vol. 15, issue 16, 1-16

Abstract: Owing to the shortcomings of blindness and inaccuracy when backfilling in goafs and based on the key stratum theory, we propose the “multi-arch pier-column” backfilling method. This method involves drilling holes at specific locations on the surface to inject filling and slurry materials into the goaf and separation area under the key stratum. This allows the broken gangue to be cemented to form a stone body, to improve its overall strength. This process, along with filling in the separation area under the key stratum, ensures that the key stratum does not break, forming a joint medium of “separation area filling body + backfilled pier-columns + key stratum + coal column”, which prevents new subsidence on the surface layer. Using the Gaojialiang coal mine as an example, the effects of the proposed method on controlling surface subsidence were determined using a numerical simulation based on FLAC 3D simulation software. The results indicate that this method can effectively control the key stratum and ensure that the surface subsidence is within a safe range. The multi-arch pier-column backfilling method utilises the self-bearing capacity of the overburden structure and greatly reduces the backfilling workload and the cost of backfilling for controlling surface subsidence. At present, the multi-arch pier-column system of the new backfill method is an unexplored and new area of research.

Keywords: multi-arch pier-column; key stratum; backfill; strata control; surface subsidence (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
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