Numerical study on the characteristics of roadway failure and instability in coal seam with rock parting

被引:3
作者
Zhang, Heng [1 ,2 ]
Zhang, Yu-Geng [3 ]
Liu, Guang-Jian [4 ,5 ]
Zhu, Ya-Wei [1 ]
Ji, Xian-Jun [1 ]
Cao, Wen-Hao [1 ]
机构
[1] Nanyang Inst Technol, Sch Civil Engn, Nanyang 473004, Henan, Peoples R China
[2] Nanyang Inst Technol, Henan Int Joint Lab Dynam Impact & Disaster Engn, Nanyang 473004, Henan, Peoples R China
[3] Guilin Univ Technol, Coll Earth Sci, Guilin 541006, Guangxi, Peoples R China
[4] Ningbo Univ, Inst Rock Mech, Ningbo 315211, Zhejiang, Peoples R China
[5] Shaoxing Univ, Collaborat Innovat Ctr Prevent & Control Mt Geol, Shaoxing 312099, Zhejiang, Peoples R China
基金
中国国家自然科学基金;
关键词
MECHANISM; INSIGHTS; STRESS; DAMAGE; MODEL;
D O I
10.1038/s41598-024-51270-w
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
In order to explore the mechanism of rockburst in coal seam with rock parting, a combination of on-site and numerical experiment is used to study the failure and instability process, crack propagation mechanism, and influencing factors. The following four points were addressed: (1) the instability is a process that roadway in coal seam with rock parting go through from stable locking in the initial stress unloading stage to slipping unlocking, and then to spatter ejection in slipping dynamic load disturbance stage. (2) The fracture development caused by unloading excavation of coal seam with rock parting will change from shear crack to tensile crack. In this process, coal-rock contact surface slip and coal-rock fracture are coupled with each other. (3) The greater the mining depth is, the greater the lateral pressure coefficient is, and the higher the rockburst risk is. On the contrary, the lower the risk of rockburst. (4) When choosing the support form of roadway in coal seam with rock parting, the two supporting forms of bolting (cable) and supplementary masonry support should be preferred. The results enrich the theory of the dynamics of surrounding rock fracture in coal mine, further clarify the potential dangers to mining-area roadways and working faces, and provide technical information to ensure the safe and efficient mining of bifurcated coal seam.
引用
收藏
页数:18
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