大同矿区回采巷道覆岩稳定性分类及支护参数优化  

Study on overburden stability classification and support parameters of mining roadway in Datong mining area

作　　者：程志斌 王祖洸 李化敏[2] 王文强 CHENG Zhibin;WANG Zuguang;LI Huamin;WANG Wenqiang(Henan Polytechnic Industrial Technology Research Institute Co.,Ltd.,Jiaozuo 454000,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]河南理工产业技术研究院有限公司,河南焦作454000 [2]河南理工大学能源科学与工程学院,河南焦作454000

出　　处：《矿业安全与环保》2023年第5期111-115,123,共6页Mining Safety & Environmental Protection

基　　金：国家重点研发计划项目(2018YFC0604500)。

摘　　要：为了规范和优化大同矿区巷道支护设计,以大同矿区典型生产矿井为研究对象,采集了80个具有代表性的矿井地质钻孔参数,采用理论分析的方法对覆岩结构特征进行分类,基于大同矿区的覆岩结构特征,提出了以覆岩结构指数为主要指标的巷道顶板稳定性分类方法,并采用数值模拟方法对大同矿区地质条件下锚杆、锚索的联合支护特征进行研究。结果表明:在预应力一定的条件下,当锚杆和锚索长度超出其有效长度后其自由端和锚固端压应力区趋于分离;在锚杆、锚索拉应力允许范围内,提高预紧力有助于提升其锚固效果;锚杆、锚索的联合支护使巷道浅部和深部围岩形成连续的压应力区,有利于巷道稳定。基于巷道围岩稳定性分类和锚杆、锚索支护机理,对大同矿区回采巷道支护参数进行规范和优化,并在大同矿区塔山、同忻、燕子山等多座矿井推广应用,社会经济效益显著。In order to standardize and optimize the roadway support design in Datong mining area,the typical production mines in Datong mining area were taken as the research objects,and 80 representative geological drilling parameters were collected.The structural characteristics of overburden structure was classified by theoretical analysis,based on the characteristics of overburden structure in Datong mining area,a classification method of roadway roof stability with overburden structure index as the main index is proposed,and the characteristics of the combined support by rockbolt and anchor cable were analyzed by numerical simulation method.The results show that,under the condition of certain prestress,when the length of the rockbolt and anchor cable exceeds its effective length,the compressive stress area of the free end and the anchor end tends to be separated;within the allowable range of the tensile stress of the rockbolt and anchor cable,increasing the pre-tightening force will help to improve its anchoring effect;the joint support of the rockbolt and anchor cable makes the shallow and deep surrounding rock of the roadway form a continuous compressive stress area,which is conducive to roadway stability.Based on the classification of roadway surrounding rock stability and the support mechanism of the rockbolt and anchor cable,the parameters of roadway support in Datong mining area are standardized and optimized,and are promoted in Tashan,Tongxin,Yanzishan and other mines in Datong mining area,with remarkable social and economic benefits.

关 键 词：覆岩结构 顶板分类 支护设计 数值模拟 回采巷道 锚杆 锚索 

分 类 号：TD353[矿业工程—矿井建设]