超埋深高应力复杂地层巷道围岩损伤分区与承载结构特征研究  

Research on Damage Zone and Load-bearing Structure Characteristics of Surrounding Rock Mass of Roadway in Complex Strata with Overburied Depth and High in Situ Stress

作　　者：雷显权[1,2,3] 刘福春 严庆文[4] 张帅帅 郭奇峰 王勇兵 汪小东[1,2] LEI Xianquan;LIU Fuchun;YAN Qingwen;ZHANG Shuaishuai;GUO Qifeng;WANG Yongbing;WANG Xiaodong(CINF Engineering Co.,Ltd.,Changsha 410019,China;Hunan Provincial Engineering Research Center for Safe and Efficient Mining Technology of Deep Mines,Changsha 410019,China;School of Resources and Safety Engineering,Central South University,Changsha 410083,China;Huize Mining Branch,Yunnan Chihong Zn&Ge Co.,Ltd.,Qujing 654200,China;School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]长沙有色冶金设计研究院有限公司,湖南长沙410019 [2]深井矿山安全高效开采技术湖南省工程研究中心,湖南长沙410019 [3]中南大学资源与安全工程学院,湖南长沙410083 [4]云南驰宏锌锗股份有限公司会泽矿业分公司,云南曲靖654200 [5]北京科技大学土木与资源工程学院,北京100083

出　　处：《金属矿山》2023年第8期171-180,共10页Metal Mine

基　　金：中铝集团科技重大专项项目(编号:ZLZX20210102)。

摘　　要：巷道围岩损伤分区与承载结构是巷道岩层控制与支护设计的重要依据。以云南某深井开采矿山1 500m埋深巷道为例,采用弹塑性理论分析、松动圈测试和数值模拟相结合的方法,研究了不同地层巷道围岩的损伤分区和承载结构特征,分析了不同围岩承载结构的差异及其与巷道稳定性的关系。结果显示:(1)巷道围岩松动圈深度范围为0.9~1.9 m,平均为1.38 m;灯影组、宰格组、大塘组和摆佐组松动圈平均深度分别为1.7 m、1.15 m、1.17 m和1.5 m。(2)数值模拟揭示巷道围岩破碎区深度范围为0.92~1.63 m,平均为1.20 m;塑性区深度范围为1.48~2.50m,平均为1.87 m;不同地层围岩损伤区深度由大到小排序为灯影组>栖霞—茅口组>宰格组>大塘组>摆佐组。(3)不同地层围岩承载区厚度差别不大,但承载区深度存在明显差异;关键承载区厚度范围为1.09~1.34 m,平均为1.28m;关键承载区的内边界深度范围为1.22~2.18 m,平均为1.58 m;不同地层围岩关键承载区深度由大到小排序为灯影组>栖霞—茅口组>宰格组>大塘组>摆佐组。研究表明:在巷道规格及所处环境相同条件下,岩体强度是影响围岩承载结构和巷道稳定性的最主要因素;岩体强度越大,承载区深度越小,损伤区深度越浅,围岩变形量越小,巷道越稳定;对于锚杆支护,锚杆有效长度等于围岩关键承载区的内边界深度是比较合理的取值。The damage zone and load-bearing structure of roadway surrounding rock are the important basis for the roadway rock control and support design.Taking 1500 m buried roadway of a deep mining mine in Yunnan province as an example,through elastoplastic theory analysis,rock loose circle test and numerical simulation,the damage zone and load-bearing structure characteristics of surrounding rock of different strata have been studied,and the difference of the load-bearing structure of different surrounding rock and its relationship with the stability of roadway have been analyzed.The results show that:①The depth of the rock loose circle ranges from 0.9 to 1.9 m,with an average of 1.38 m;and the average depth of the rock loose circle in Dengying Formation,Zaige Formation,Datang Formation and Baizuo Formation is 1.7 m,1.15 m,1.17 m and 1.5 m,respectively.②The numerical simulation reveals that the depth of the broken zone of surrounding rock ranges from 0.92 to 1.63 m,with an average of 1.20 m;and the depth of the plastic zone of surrounding rock ranges from 1.48 to 2.50 m,with an average of 1.87 m;the depth of damage zone in different strata is ranked as Dengying Formation>Qixia-Maokou Formation>Zaige Formation>Datang Formation>Baizuo Formation. ③ The difference in the thickness of the load-bearing zone ofdifferent strata is little,but the difference in the depth of the load-bearing zone is obvious;the thickness of the critical loadbearingzone ranges from 1. 09 to 1. 34 m,with an average of 1. 28 m;the depth of the inner boundary of the critical load-bearingzone ranges from 1. 22 m to 2. 18 m,with an average of 1. 58 m;the depth of the critical load-bearing zone in different stratais ranked as Dengying Formation>Qixia-Maokou Formation>Zaige Formation>Datang Formation>Baizuo Formation. The researchshows that:Under the same conditions of roadway size and environment,the strength of rock mass is the most importantfactor affecting the load-bearing structure of surrounding rock and the stability of roadway. The greater th

关 键 词：深井开采 巷道支护 围岩控制 承载结构 松动圈 高应力 

分 类 号：TD353[矿业工程—矿井建设]