Analysis of catastrophic instability of roof-rib pillar support system under backfill mining

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  • 1. State Key Laboratory of Geomechanics and Geolechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China 2. University of Chinese Academy of Sciences, Beijing 100049, China 3. School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, Hubei 430068, China
LIU Xuan-ting male, born in 1995, PhD candidate, focusing on surface rock movement and underground mining stability.

Online published: 2021-12-14

Supported by

the Young Scholar Fund of National Natural Science Foundation of China(42002292).

Abstract

A roof?rib pillar support system is often formed in the metal mines that applied to the backfill mining method. In order to ensure the safe mining, it is of great significance to explore the failure mechanism of the roof?rib pillar support system under backfill mining. On the basis of considering the side pressure effect of the backfill on the rib pillar, a mechanical model of the roof?rib pillar support system under backfill mining was established. Furthermore, the catastrophe theory was used to explore the failure mechanism of the supporting system under the action of the filling body, and the influence of the structural parameters of the support system before and after filling on the stability of the stope was analyzed. The research results show that under the condition of certain mechanical properties of the rock mass, the stability of the roof?rib pillar support system under backfill mining is controlled by the stope structure parameters (roof thickness, stope span, rib pillar width, rib pillar height), the overburden load and the side pressure of the backfill. The addition of the filling body will reduce the stiffness ratio of the support system, thereby improving the stability of the stope. When the stope is at an unfilled state, the optimization sequence of the structural parameters of the support system should be roof thickness, stope span, rib pillar width and rib pillar height. When the stope is at the state of filling, the optimization sequence should be roof thickness, rib pillar width, stope span, and rib pillar height. The combination of theoretical derivation and numerical simulation is applied in the supporting project to verify the correctness of theoretical derivation.

Cite this article

LIU Xuan-ting, CHEN Cong-xin, LIU Xiu-min, XIA Kai-zong, ZHANG Chu-qiang, WANG Tian-long, WANG Yue, . Analysis of catastrophic instability of roof-rib pillar support system under backfill mining[J]. Rock and Soil Mechanics, 2021 , 42(9) : 2461 -2471 . DOI: 10.16285/j.rsm.2021.5453

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