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Thickness of Horizontal Pillar for Safe Extraction Under Arching Effect of Cemented Backfill
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Jiangchen JIANG1, Yongfei YE1, Xiaosheng LIU2
Mining and Metallurgical Engineering | 2024, 44(1) : 39 - 43
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Mining and Metallurgical Engineering | 2024, 44(1): 39-43
• MINING •
Thickness of Horizontal Pillar for Safe Extraction Under Arching Effect of Cemented Backfill
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Jiangchen JIANG1, Yongfei YE1, Xiaosheng LIU2
Affiliations
  • 1.Zhongye Changtian International Engineering Co Ltd, Changsha 410006, Hunan, China
  • 2.School of Resources & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China
Published: 2024-02-01 doi: 10.3969/j.issn.0253-6099.2024.01.009
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Based on an established three-dimensional analytical model for arching stress of cemented backfill, a calculation formula for vertical load of cemented backfill was obtained. According to a model of four-sided fixed roof and a criterion for ultimate tensile strength of rock mass, a method to determine the thickness of horizontal pillar for safe extraction was obtained. The application practice of horizontal pillar extraction in 612 stope of a lead-zinc mine shows that the vertical stress of cemented backfill calculated with this analytical model is basically consistent with the numerical simulation results, and no plastic zone occurs in the roof in numerical simulation, which verifies that the reserved roof thickness determined by calculation meets the requirement of safe production. The results of stoping process show that the maximum cumulative displacement near the monitoring point is lower than the displacement limit, and the reserved roof tends to be stable. It is concluded that the determined thickness of horizontal pillar is reliable for safe extraction.

cemented backfill  /  arching effect  /  extraction of horizontal pillar  /  thin plate theory  /  extraction  /  safe thickness
Jiangchen JIANG, Yongfei YE, Xiaosheng LIU. Thickness of Horizontal Pillar for Safe Extraction Under Arching Effect of Cemented Backfill[J]. Mining and Metallurgical Engineering, 2024 , 44 (1) : 39 -43 . DOI: 10.3969/j.issn.0253-6099.2024.01.009
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Article Info
doi: 10.3969/j.issn.0253-6099.2024.01.009
  • Receive Date：2023-08-23
  • Online Date：2026-03-20
  • Published：2024-02-01
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  • Received：2023-08-23
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Affiliations
    1.Zhongye Changtian International Engineering Co Ltd, Changsha 410006, Hunan, China
    2.School of Resources & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China
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https://castjournals.cast.org.cn/joweb/kygczz/EN/10.3969/j.issn.0253-6099.2024.01.009
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Citations
表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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