坚硬顶板条件下沿空掘巷小煤柱留设尺寸及围岩控制技术研究  

Research on small pillar remaining width and surrounding rock control technology in gob-side entry driving with hard roof

作　　者：张礼 ZHANG Li(CCTEG China Coal Research Institute,Chaoyang,Beijing 100013,China;State Key Laboratory of Coal Mine Disaster Prevention and Control,Chaoyang,Beijing 100013,China;Beijing Coal Mine Safety Engineering and Research Center,Chaoyang,Beijing 100013,China)

机构地区：[1]煤炭科学技术研究院有限公司,北京市朝阳区100013 [2]煤矿灾害防控全国重点实验室,北京市朝阳区100013 [3]北京市煤矿安全工程技术研究中心,北京市朝阳区100013

出　　处：《中国煤炭》2024年第11期76-85,共10页China Coal

摘　　要：为研究大采高坚硬顶板条件下小煤柱留巷围岩稳定性控制技术,以乡宁矿区申南凹煤矿坚硬顶板大采高开采实际工程为背景,综合运用理论分析、数值模拟和现场试验等方法,从邻空侧覆岩结构、小煤柱留设宽度及巷道围岩稳定性控制技术3个方面进行了研究。以申南凹煤矿20108工作面小煤柱沿空掘巷为实际工程背景,建立了坚硬顶板条件下邻空侧覆岩结构力学模型,推导出坚硬顶板条件下内应力场长度计算式,进而得出小煤柱尺寸理论宽度为7.27 m;采用数值模拟对比分析不同煤柱留设宽度下的巷道围岩应力、塑性区分布特征、两帮及顶底板移近量等关键信息,优选出最佳的留巷方案,并进行了现场工业性试验。研究表明,采用6 m护巷煤柱配合“高预紧力锚网索+M钢带+锚梁”联合支护方式,在回采期间两帮最大绝对移近量可控制在520 mm以内,巷道未出现冒顶、煤柱崩溃、锚杆整体移出等现象。In order to study the surrounding rock stability control technology of roadway retaining with small pillar under the condition of hard roof,taking the practical engineering of large-height mining with hard roof in Shennanwa Coal Mine in Xiangning mining area as the background,the theoretical analysis,numerical simulation and field test methods were comprehensively used to study on the gob-side overburden structure,small pillar width and roadway surrounding rock stability.Based on the actual engineering background of gob-side entry driving with small pillar in 20108 working face in Shennanwa Coal Mine,the mechanical model of the gob-side overburden structure under the condition of hard roof was established,and the calculation formula of the length of the internal stress field under the condition of hard roof was derived,and then the theoretical width of the small pillar was determined as 7.27 m.Numerical simulation was used to compare and analyze key information such as stress,plastic zone distribution characteristics,displacement of the two sides and the roof and floor of the surrounding rock with different coal pillar widths.The optimal roadway retaining scheme was selected and industrial tests were conducted on site.Research had shown that using a 6-meter roadway pillar combined with a support method with high pre-tension anchor mesh cable,M-steel strip,and anchor beam,the maximum absolute displacement of the two sides during mining could be controlled within 520 mm with no occurrences of roof collapse,coal pillar collapse,or overall removal of anchor bolts in the roadway.

关 键 词：坚硬顶板 沿空掘巷 小煤柱宽度 围岩稳定性控制 

分 类 号：TD822.3[矿业工程—煤矿开采] TD353[矿业工程—矿山开采]