摘要
针对淮南谢桥煤矿11618工作面运输顺槽面临的厚硬顶板强矿压问题,本研究采用数值模拟与现场监测相结合的方法,系统分析了预裂爆破切顶卸压技术对巷道围岩应力场的调控机理,基于摩尔-库伦准则构建FLAC3D模型,揭示了切顶前后应力演化的动态特征。研究结果表明:切顶卸压技术显著优化了顶板应力分布,垂直应力峰值降低17.8%,促使应力集中带向煤体深部转移3.4 m;同时,超前支承压力峰值由未切顶时的63 MPa降至56 MPa,但煤帮垂直应力峰值因应力再分配升高21%。现场实测显示,顶底板最大移近量低于300 mm预警阈值,锚杆锚索支护承载力稳定,验证了该技术对围岩变形的有效控制。
For addressing the intense strata pressure induced by thick-hard roof in the haulage gateway of No.11618 transport roadway at Xieqiao Mine in Huainan,a combined methodology of numerical simulation and field monitoring was employed to systematically analyze the regulatory mechanism of presplitting blasting roof-cutting and pressure relief technology on the stress field of surrounding rock.A FLAC3D model,founded on the Mohr-Coulomb criterion,was developed to elucidate the dynamic evolution characteristics of stress fields before and after roof-cutting.The results demonstrated that the roof-cutting and pressure relief technology significantly optimized the roof stress distribution:the vertical stress peak decreased by 17.8%,and the stress concentration zone shifted 3.4 m deeper into the coal mass.Concurrently,the peak of advanced abutment pressure reduced from 63 MPa(without roof-cutting)to 56 MPa,while the vertical stress peak in the coal rib increased by 21%due to stress redistribution.Field monitoring data revealed that the maximum roof-floor convergence remained below the 300 mm warning threshold,and the bearing capacity of bolt-cable support systems remained stable,confirming the effectiveness of this technology in controlling surrounding rock deformation.
作者
杨德传
刘浩
刘畅
Yang Dechuan;Liu Hao;Liu Chang(School of Mining Engineering,Anhui University of Science and Technology,Huainan 232001,China;Xieqiao Colliery of Huaihe Energy Co.,Ltd.,Huainan 232001,China)
出处
《煤炭与化工》
2025年第6期13-17,共5页
Coal and Chemical Industry
关键词
厚硬顶板
切顶卸压
应力转移
数值模拟
围岩控制
thick-hard roof strata
roof-cutting pressure relief
stress transfer
numerical simulation
surrounding rock control
