深部软岩巷道变形破坏原因及支护技术研究  

Research on causes of deformation and damage of deep soft rock roadway and supporting technology

作　　者：冉霞 Ran Xia(CCTEG Chongqing Research Institute,Chongqing 400039,China)

机构地区：[1]中煤科工集团重庆研究院有限公司,重庆400039

出　　处：《能源与环保》2024年第10期260-265,共6页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：中国煤炭科工集团有限公司重点项目(2023-TD-ZD001-005);国家自然科学基金面上项目(52274092);重庆市教委科学技术研究计划项目(KJQN202303405)。

摘　　要：为了解决深部破碎软岩巷道围岩大变形、难支护的问题,以山西宁武德盛煤业有限公司502采区轨道大巷为工程背景,通过现场勘测和试验研究分析了巷道围岩变形破坏机理,得出围岩强度低、易软化是围岩大变形的内在原因,而高地应力则是大变形的外在诱因。据此提出了“锚杆+锚索+钢筋网+喷射混凝土+注浆”联合支护技术方案,并通过数值计算验证了该方案的可靠性。现场监测结果表明,采用该联合支护技术方案后,巷道顶板最大下沉量为73.1 mm,两帮最大移近量为153.9 mm,最大底鼓量为88.7 mm,围岩变形量均在规定允许值以内,且监测结果与数值计算结果相吻合,有效控制了深部破碎软岩巷道围岩的变形破坏。In order to solve the problem of large deformation and difficult to support the surrounding rock of deep fractured soft rock roadway,the deformation and destruction mechanism of the surrounding rock of the roadway was analyzed through on-site investigation and experimental research with the engineering background of the track roadway of No.502 mining area of Shanxi Ningwu Desheng Coal Co.,Ltd.,it was found that the low strength and easy softening of the surrounding rock are the internal reasons for the large deformation of the surrounding rock,while high ground stress is the external cause of the large deformation.Accordingly,the"anchor+anchor cable+steel mesh+shotcrete+grouting"joint supporting technology scheme was proposed,and the reliability of the scheme was verified by numerical calculation.Field monitoring results showed that,after adopting this joint supporting technology scheme,the maximum value of roof subsidence was 73.1 mm,the maximum value of convergence of two gangs was 153.9 mm,and the maximum value of floor heave was 88.7 mm,and the surrounding rock deformation was within the permissible value,and the monitoring results coincided with the results of numerical calculations,which can effectively control the deformation of the surrounding rock of the deep fractured soft rock roadway.

关 键 词：深部破碎 软岩巷道 大变形 高地应力 联合支护 

分 类 号：TD353[矿业工程—矿井建设]