深部软岩大变形巷道变径分区卸压围岩控制技术及应用  

Control technology and application of variable-diameter zoned pressure relief for surrounding rock in deep soft rock and large deformation roadway

作　　者：吴锋锋[1,2] 谷浩源 杨培举[1,2] 刘长友[1,2] 魏民涛 蒋与飞 王平 WU Fengfeng;GU Haoyuan;YANG Peiju;LIU Changyou;WEI Mintao;JIANG Yufei;WANG Ping(School of Mines,China University of Mining and Technology,Xuzhou 221116,China;State Key Laboratory of Coal Exploration and Intelligent Mining,China University of Mining and Technology,Xuzhou 221116,China;Henan Sunho Group Co.,Ltd.,Yongcheng 476600,China;Henan Sunho Xinglong Mining Co.,Ltd.,Xuchang 461000,China)

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116 [2]中国矿业大学煤炭精细勘探与智能开发全国重点实验室,江苏徐州221116 [3]河南神火集团有限公司,河南永城476600 [4]河南神火兴隆矿业有限责任公司,河南许昌461000

出　　处：《煤炭科学技术》2025年第2期53-67,共15页Coal Science and Technology

基　　金：国家自然科学基金面上资助项目(52174138)。

摘　　要：为解决深部软岩巷道围岩大变形、返修次数多难题,以泉店煤矿21运输下山为工程背景,采用理论分析、数值模拟及工程实践等方法,提出了巷道变径分区卸压技术,建立了卸压参数理论模型,得出了卸压关键参数选取区间与弹性应变能密度分布规律,揭示了钻孔卸压能量耗散原理,确定了卸压关键参数的最佳取值。研究表明:(1)通过变径分区卸压技术改善了浅部围岩能量环境,减少了顶底板能量升高区面积,并将肩角和底角区域聚集能量向深部转移,实现了巷道精准卸压控制。(2)随着浅部小直径钻孔长度(L1)、深部大直径钻孔长度(L2)、深部大直径钻孔半径(r)增加,其弹性应变能密度曲线相应的前峰值、后峰值以及后峰值升高,整体呈正相关。(3)随着深部大直径钻孔间距(D)增加,孔间弹性应变能密度峰值变化呈现先升高后降低再稳定的特点,而钻孔间联合卸压效果与其呈现负相关,依据弹性应变能量峰值增幅得出了影响卸压效果的关键参数权重顺序依次为:L1、L2、r、D。(4)依据理论分析和数值模拟确定了21采区运输下山巷道卸压技术关键参数合理值,巷道实施变径分区卸压技术后,两帮及顶底板变形量分别降低了58.7%、23.7%以及27.4%,巷道稳定得到有效控制,证实了变径分区卸压技术的有效性。Addressing significant deformation in the surrounding rock of deep soft rock road-ways subjected to repetitive repairs,this study focuses on the 21st transportation downhill of Quandian coal mine as the engineering context.We propose the variable-diameter par-tition roadway pressure relief technology.This approach utilizes theoretical analysis,numerical simulation,and practical engineering meth-ods.We established a theoretical model for pressure relief parameters,derived essential parameters for pressure relief,and outlined the dis-tribution pattern of elastic strain energy density.Additionally,we uncovered the principles governing energy dissipation in borehole un-loading,ultimately determining the optimal value for key pressure relief parameters.The study findings indicate the following:①The variable-diameter zoned pressure relief technology enlarges the energy reduction zone near the roadway while diminishing the energy elev-ation zone in the roof and floor.It redirects concentrated energy from the shoulder and floor corners deeper into the area,achieving precise pressure relief control within the roadway.②Increasing the length of shallow small-diameter boreholes(L1),the length of deep large-dia-meter boreholes(L2),and the radius of deep large-diameter boreholes(r)corresponds to increasing pre-peak,post-peak,and post-peak val-ues in the elastic strain energy density curves,demonstrating an overall positive correlation.③As the spacing(D)of deep large-diameter boreholes increases,the peak value of elastic strain energy density between holes shows the characteristics of firstly increasing,then de-creasing and then stabilizing,and the effect of unloading joint pressure between boreholes is negatively correlated with it,and based on the magnitude of the increase in the peak value of elastic strain energy,the key parameters affecting the effect of unloading are weighted as follows in the order of:L1,L2,r and D.④Based on the theoretical analysis and numerical simulation to determine the key parameters of the

关 键 词：深部大变形巷道 软岩 能量释放 弹性能密度 变径分区卸压技术 

分 类 号：TD353[矿业工程—矿井建设]