Analysis and control of the stability of irregular coal pillars under the influence of mining activities
Wen Yan1, Wang Shipeng2, Han Chuanlei2, Zhao Yanxi2
1. College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China;
2. Wenshang Yiqiao Mine Co., Ltd., Jining 272500, China
To assess the stability of three irregular coal pillars during mining in No.2305 face, theoretical calculations were first conducted to analyze the stability coefficients of these pillars. Subsequently, numerical simulation methods were employed to investigate the stress distribution characteristics and stability of the irregular coal pillars under the influence of mining activities. The research findings indicated that the stability coefficients of the three irregular coal pillars were 1.19, 1.33, and 1.25 respectively, suggesting they could maintain stability after the mining face extraction. During the extraction process, the maximum stresses measured on these irregular coal pillars were 61.1 MPa, 60.3 MPa, and 42.5 MPa respectively, with peak stress concentration factors of 3.76, 3.71, and 2.62. As the mining face advanced, the stress distribution of the irregular coal pillars generally exhibited a saddle-shaped pattern, with evident elastic core zones. Based on comprehensive assessment, it was concluded that the irregular coal pillars could remain stable during mining face extraction, and corresponding control measures were formulated to prevent instability-induced impact disasters caused by mining activities.
文 龑1，王士朋2，韩传磊2，赵燕席2. 采动影响下不规则煤柱稳定性分析与控制[J]. 煤炭与化工, 2024, 47(12): 16-21.
Wen Yan1, Wang Shipeng2, Han Chuanlei2, Zhao Yanxi2. Analysis and control of the stability of irregular coal pillars under the influence of mining activities. CCI, 2024, 47(12): 16-21.
