Numerical Study on Characteristics of Stick-Slip Instability of Coal-Rock Parting-Coal Structure under Lateral Unloading

Author:

Zhang Heng12,Liu Guang-Jian3ORCID,Ji Xian-Jun1,Cao Wen-Hao1,Zhu Ya-Wei1,Bacha Sher4

Affiliation:

1. School of Civil Engineering, Nanyang Institute of Technology 1 , Nanyang, Henan , China

2. Henan International Joint Laboratory of Dynamics of Impact and Disaster of Engineering Structures, Nanyang Institute of Technology 2 , Nanyang, Henan , China

3. Collaborative Innovation Center for Prevention and Control of Mountain Geological Hazards of Zhejiang Province, Shaoxing University 3 , Shaoxing, Zhejiang , China

4. Department of Mining Engineering, Balochistan University of Information Technology, Engineering and Management Sciences 4 , Quetta , Pakistan

Abstract

Abstract Unloading excavation can increase the possibility of rock burst, especially for coal seam with rock parting. In order to explore the evolution process of rock burst under lateral unloading, the combination of in situ measures and numerical experiments is used to study. The following four points were addressed: (1) the coal seam with rock parting easily causes the stick-slip and instability along the interface, and the process of stick-slip and instability has hysteresis characteristics; (2) the greater the degree of unloading or the smaller the interface friction angle of the Coal-Rock Parting-Coal Structure (CRCS), the more likely it is for stick-slip and instability to occur; (3) the abnormal increase of shear stress and slip dissipation energy can be used as the precursory information of the stick-slip and instability of CRCS; (4) the damage intensity of rock burst induced by stick-slip and instability of CRCS can be reduced by reducing the unloading speed or increasing the roughness of interface. The research results can be used for early warning and controlling of dynamic disaster induced by stick-slip instability in coal seam with rock parking.

Publisher

GeoScienceWorld

Subject

Geology

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