Shi Zhanshan, Wang Jun, Hao Jianfeng, Qin Bing
Erdos Research Institute, Liaoning Technical University, Erdos, 017000, China.
Mining College, Liaoning Technical University, Fuxin, 123000, China.
Sci Rep. 2025 Mar 28;15(1):10719. doi: 10.1038/s41598-025-94191-y.
Aiming at the problem of surrounding rock control during the 52,102 working face passing through the roof fall area of return air roadway in lijiahao coal mine. Through on-site investigations, numerical simulations, and engineering practices, we analyzed the characteristics and causes of roof fall along the rib of the goaf. Based on the Mohr-Coulomb criterion, a numerical model was established, identifying influencing factors, and proposing an early intervention pressure relief control technology centered on "proactive avoidance." Determined the starting position and the staggered distance of the avoiding roadway. The study indicates that: (1) The deformation of the surrounding rock in the roof fall roadway is mainly affected by high static loads, mining pressure, mechanical properties of the surrounding rock, and the effect of pressure relief. The optimal timing for implementing the best prevention technology is to stop mining and excavate an avoidance roadway when the working face is 20 m away from the roof fall area. At the same time, based on safety and economic principles, determine the distance between the avoiding roadway and the original roadway is 20 m to shorten the length of the working face. After passing through the avoidance roadway, resume the use of the original roadway to ensure economic benefits. (2) Early proactive intervention pressure relief technology effectively reduces the deformation of the roadway surrounding rock, decreasing the amount of deformation on both sides by about 11%, verifying its effectiveness and practicality.
针对李家壕煤矿52102工作面回风顺槽过冒顶区期间的围岩控制问题，通过现场调研、数值模拟和工程实践，分析了采空区沿空留巷顶板冒落的特征及原因。基于莫尔-库仑准则建立数值模型，识别影响因素，提出以“主动避让”为核心的超前干预卸压控制技术，确定了避让巷道的起始位置和错距。研究表明：（1）冒顶巷道围岩变形主要受高静压、采动压力、围岩力学性质及卸压作用影响。实施最佳防治技术的最佳时机是当工作面距冒顶区20m时停止采煤并开掘避让巷道。同时，基于安全和经济原则，确定避让巷道与原巷道间距为20m，以缩短工作面长度，过避让巷道后恢复使用原巷道以确保经济效益。（2）超前主动干预卸压技术有效降低了巷道围岩变形，两帮变形量减小约11%，验证了其有效性和实用性。
