重庆大学学报2026，Vol.49Issue(6)：1-13,13.DOI:10.11835/j.issn.1000-582X.2024.274
柔模砼墙沿空留巷工作面覆岩垮落结构及裂隙演化规律
Caving structure and crack evolution of overlying strata in gob-side entry retaining with flexible formwork concrete walls
摘要
Abstract
This study investigates the differences in roof caving structure and crack evolution between gob-side entry retaining and traditional coal pillar mining.Taking the 52605 and 52606 working faces of Daliuta Coal Mine as the engineering background,two sets of similar-material simulation experiments were conducted to reproduce the mining processes under both conditions.The movement and fracture evolution of the overlying strata were systematically recorded and analyzed.The results show that,under gob-side entry retaining with flexible formwork concrete walls,the crack development rate at the end of primary mining is lower than that during secondary mining.In contrast,under traditional coal pillar mining,the crack evolution patterns on both sides of the coal pillar are similar.Significant differences are observed between the two mining methods in terms of crack rate,crack type,caving range,and caving angle.Specifically,for gob-side entry retaining,the crack rate of overlying strata reaches 5.0756%,the caving range extends to within 50m,and the caving angle varies from 31° to 86.9°.For coal pillar mining,the crack rate is 2.8604%,the caving range is within 40 m,and the caving angle ranges from 50° and 52°,with shear cracks dominating along the caving direction.After mining with gob-side entry retaining,the roof strata on both sides of the concrete wall remain stable without sliding,forming a hinged structural system.In contrast,in coal pillar mining,the overlying strata on both sides of the pillar tend to fail together as a whole after extraction.These structural differences lead to distinct load transfer mechanisms,resulting in significant stress concentration effects on the concrete wall in gob-side entry retaining faces.关键词
无煤柱开采/覆岩垮落/采动裂隙/柔模混凝砼墙/相似材料模拟Key words
non-pillar mining/overlying strata caving/mining-induced fractures/flexible formwork concrete wall/similar-material simulation分类
矿业与冶金引用本文复制引用
石占山,范永君,李刚,迟国铭,刘航,陈文杰..柔模砼墙沿空留巷工作面覆岩垮落结构及裂隙演化规律[J].重庆大学学报,2026,49(6):1-13,13.基金项目
国家自然科学基金资助项目(52004118,52174077).Supported by National Natural Science Foundation of China(52004118,52174077). （52004118,52174077）
