School of Safety Engineering,North China Institute of Science and Technology
School of Mine Safety,North China Institute of Science and Technology
Xiaoyun Coal Mine of Jining Mining GroupCo.,Ltd.
Anhui Jiegou Mining Co.,Ltd.

为合理控制薄煤层灰岩顶板巷道稳定性,避免过度支护引起巷道顶板失稳。以鲁西某矿薄煤层灰岩顶板巷道为研究对象,运用数值模拟、理论计算等研究方法,研究了不同类型灰岩顶板采场应力分布特征、围岩矿压显现规律及其塑性破坏形态特征,灰岩临界安全厚度影响性分析。研究结果发现:实体巷道的应力环境较好,应力集中程度相对较低,而沿空巷受2次采动影响范围更大、应力集中程度更高。煤矿巷道围岩在不同应力环境下需要不同程度的支护,主要集中在加强巷道两帮的支护和在特定情况下加强超前影响范围内的支护。

To ensure the stability of the thin coal seam grey limestone roof roadway and prevent excessive support from causing instability of the roadway roof,this study focuses on a roadway in a coal mine in Luxi,China.Using numerical simulation,theoretical calculation,and other research methods,the study investigates the stressdistribution characteristics of different types of grey limestone roof strata,the manifestation rules of surroundingrock pressure,the characteristics of plastic failure morphology,and the influence analysis of the critical safethickness of the limestone.The research findings are as follows:The stress environment of the solid roadway isrelatively favorable,with a lower degree of stress concentration,while along the void roadway,the influencerange of the secondary mining is larger,and the degree of stress concentration is higher.Different degrees ofsupport are required for the surrounding rock of the coal mine roadway under different stress environments,mainly focusing on strengthening the support on both sides of the roadway and,under specific conditions,enhancing the support within the advanced influence range.