School of Civil Engineering, North China University of Technology
College of Mining, Guizhou University

为确定近距离煤层群同采工作面合理错距揭示覆岩破断演化规律,以02号、2号煤层群同采工作面为研究对象,运用理论模型计算了上位煤层底板破坏深度和同采错距,建立了数值模型分析同采错距为35、40、45m条件下的层间岩层支承应力分布,并采用相似模拟试验研究了近距离煤层同采工作面覆岩破断演化特征。研究结果表明:上位煤层支承应力通过工作面传递到底板岩层,底板破坏深度为5.45m,工作面后方底板岩层支承压力最大影响范围接近38m;层间岩层支承压力存在2次峰值,当同采错距为40m时,层间岩层支承压力的2次峰值均较小,确定同采合理错距为40m;上位工作面的顶板初次垮落步距和周期垮落步距分别为40m和15~20m,下位工作面基本顶的初次和周期垮落步距显著增大至80m和20~30m;当同采错距布置为40m时,下位煤层工作面受上部煤层采动影响较小。

To determine the reasonable staggered distance of the contiguous coal seams and reveal the evolution of overburden fracture development, the theoretical model was used to calculate the damage depth of the upper coal seam floor and the staggered distance for the and coal seams group. A numerical model was established to analyze the distribution of abutment stress for the middle rock strata under the conditions of meters, meters, and meters staggered distances. Physical simulation experiments were also performed to study the characteristics of overburden fracture evolution. The results showed that the abutment stress of the upper coal seam was transmitted to the floor rock through the working face, and the damage depth was 5. 45 meters. The maximum influence range of the abutment pressure in the floor rock layers behind working face was close to meters. The abutment pressures of the interlayer rock layers experienced two peaks. When the staggered distance was meters, both peaks of abutment pressures above the lower coal seam working face were smaller, and the reasonable staggered distance was determined to be meters. The initial and periodic collapse intervals of upper working face roof were meters and 15~20 meters, respectively, while those of the main roof of lower working face were significantly increased to meters and 20~30 meters. When the staggered distance for the two mining faces was meters, the lower coal seam working face was less affected by the mining of the upper coal seam.

国家自然科学基金项目(52004010);北京市属高等学校优秀青年人才培育计划项目(BPHR202203036);贵州省科技计划项目(黔科合支撑[2023]一般122);贵州省教育厅2023年度高等学校科技创新团队(黔教技[2023]055号)

宋高峰,黄鹏,昝明惠,等.近距离煤层群同采工作面合理错距确定及覆岩破坏特征研究[J].煤炭工程,2024,56(6):1-7.