Study on the Partial Paste Backfill Mining Method in a Fully Mechanized Top-Coal Caving Face: Case Study from a Coal Mine, China

Zhaowen Du, Deyou Chen, Xuelong Li (), Yong Jian, Weizhao Zhang, Dingding Zhang and Yongfeng Tian
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Zhaowen Du: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Deyou Chen: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Xuelong Li: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Yong Jian: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Weizhao Zhang: Shandong Energy Group Northwest Mining Company, Xi’an 710018, China
Dingding Zhang: Shandong Energy Group Northwest Mining Company, Xi’an 710018, China
Yongfeng Tian: Shandong Energy Group Dispatching Command Center, Jinan 250101, China

Sustainability, 2024, vol. 16, issue 11, 1-24

Abstract: Paste backfill mining is an significant part of green coal mining, which can improve resource utilization and extend the service life of mines. It is important for solving the “three under, one above” mining problem and avoiding industrial wastes such as coal gangue and fly ash that occupy farmland and pollute the environment. To address the difficult filling problem of a fully mechanized top-coal caving face (FMT-CCF), a new method of partial paste backfill mining is herein proposed. First, the partial paste backfill mining method and implementation steps of the FMT-CCF are introduced in detail. Then, the mechanistic model of the roof beam in partial paste backfill mining is established. Then, the filling structural factors on the filling effect of the 42105 FMT-CCF are determined. Dependent on the assay of the migration law of overlying stratum after filling, numerical simulation analysis is used to research the feature effect of the main filling structural factors on the filling effect. Finally, the paste filling rate, filling width, and filling strength suitable for the 42105 FMT-CCF are obtained. When the filling rate reaches 100%, a significant alteration takes place, resulting in the efficient decrease of the overlying rock stress arch shell’s height. As the width of the filling body expands from 10 m at each end to 20 m, the stress arch of the overlying rock experiences maximum reduction, specifically decreasing by approximately 14 m. When the strength of the filling body is greater than 0.4 GPa, the filling effect is better. This study has important guidance and reference significance for the partial paste backfill of FMT-CCF in thick seam mining.

Keywords: paste backfill mining; fully mechanized top-coal caving; partial paste backfill; filling structural factors; filling effect (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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