综放面停采线厚硬顶板爆破切顶护巷技术研究与应用  

Research and Application of Roof Cutting and Supporting Roadway Technology by Blasting for Thick and Hard Roof at the Stopping Line of Fully Mechanized Caving Face

作　　者：李东印[1] 邝云锋 王伸[1] 张景轩 王逍康 LI Dongyin;KUANG Yunfeng;WANG Shen;ZHANG Jingxuan;WANG Xiaokang(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo,Henan 454001,China;Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines,Northeastern University,Shenyang,Liaoning 110819,China)

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作市454001 [2]东北大学深部金属矿山安全开采教育部重点实验室,辽宁沈阳110819

出　　处：《矿业研究与开发》2023年第9期105-112,共8页Mining Research and Development

基　　金：国家自然科学基金青年科学基金项目(52204090);河南理工大学基本科研业务费专项资助项目(NSFRF210334)。

摘　　要：恒泰煤矿13030综放工作面顶板厚硬砂岩层达23.9 m,普氏系数高达10.8~14.3,末采阶段采区下山巷道围岩受采动影响发生严重变形破坏。为解决上述问题,对超前工作面停采线爆破切顶预裂顶板技术展开了研究。采用理论分析和数值模拟方法确定了最优切顶高度为25.4 m,最优切顶角度为75°;基于现场试验确定了最优爆破钻孔间距为2400 mm,装药结构为分段均匀装药;与未切顶相比,停采线切顶工作面的超前支承应力峰值下降23%,有效改善了下山巷道的应力环境。现场工业试验应用结果表明,巷道变形在工作面停采25 d后趋于稳定,两帮最大移近量为340 mm,顶底板最大移近量为380 mm,经维修及加固后即可为下一工作面服务,围岩控制效果良好。The thick and hard sandstone layer of 13030 fully mechanized caving face in Hengtai Coal Mine is 23.9 m,and the value of Platts coefficient is up to 10.8-14.3.As entering the end mining stage,the surrounding rock of downhill roadway in mining area will be seriously deformed and destroyed by mining.To address the above issues,research was conducted on the technology of roof cutting and pre-splitting by blasting at the stopping line of the advanced working face.Using theoretical analysis and numerical simulation methods,the optimal roof cutting height and the optimal roof cutting angle were determined as 25.4 m and 75°.Based on field test,the optimal blast hole spacing was determined to be 2400 mm,and the charge structure was segmented uniform charge.Compared with the condition without roof cutting,the peak value of the advanced support stress in the roof cutting face of the stopping line was reduced by 23%,which can effectively improve the stress environment of downhill roadway.The field industrial test results show that the roadway deformation tends to be stable after 25 days of stopping mining,the maximum displacement of the two sides is 340 mm,and the maximum displacement of the roof and floor is 380 mm.After repairing and reinforcement,the roadway can serve the next working face,with a favorable control of the surrounding rock.

关 键 词：综放开采 停采线切顶 厚硬顶板 爆破切顶 巷道围岩控制 

分 类 号：TD235.33[矿业工程—矿井建设] TD322.4