金川二矿区地应力特征及其对巷道变形破坏的影响研究  

Study on Ground Stress Characteristics and Its Influence on Roadway Deformation Failure in Jinchuan No.2 Mining Area

作　　者：李光 马凤山[1,2] 郭捷[1,2] 邹龙[3] 寇永渊[3] LI Guang;MA Fengshan;GUO Jie;ZOU Long;KOU Yongyuan(Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Institutions of Earth Science,Chinese Academy of Sciences,Beijing 100029,China;Jinchuan Group Co.,Ltd.,Jinchang 737100,Gansu,China)

机构地区：[1]中国科学院地质与地球物理研究所,中国科学院页岩气与地质工程重点实验室,北京100029 [2]中国科学院地球科学研究院,北京100029 [3]金川集团股份有限公司,甘肃金昌737100

出　　处：《黄金科学技术》2021年第6期817-825,共9页Gold Science and Technology

基　　金：国家自然科学基金面上项目“深部矿山胶结充填体与围岩接触带力学行为及变形机理研究”(编号:42072305);“金属矿山地下采动引起的竖井变形破坏机理研究”(编号:41772341);国家自然科学基金重点项目“海底采矿对地质环境的胁迫影响与致灾机理”(编号:41831293)联合资助。

摘　　要：随着地下工程建设不断向地球更深处发展,高地应力已成为影响深部巷道围岩稳定性的关键因素。针对金川二矿区高地应力问题,总结研究区地应力分布特征,采用离散元数值方法计算了3种不同地应力条件下巷道围岩的变形破坏过程。所得主要结论包括:(1)研究区地应力分布离散性较强,已测最大主应力多数为水平方向,但随着埋深的增加,竖直主应力逐渐接近水平主应力;(2)均质围岩巷道变形模式主要为顶板下沉和底鼓,变形主要依靠塑性流动,高地应力未改变巷道围岩变形模式,但加剧了其破坏程度;(3)在以水平地应力为主导的条件下开挖巷道,应加强顶、底板的支护,且塑性变形往往具有显著的时间效应,施工中应对巷道变形进行周期性监测。With the development of underground engineering construction to the deeper earth,high ground stress has become a key factor affecting the stability of deep roadway surrounding rock.Under the action of high in-situ stress,the mechanical behavior characteristics and microstructure of deep rock mass change significantly compared with shallow rock mass,which is the cause of frequent mining accidents in deep underground engineering,and also the research focus in the field of rock mechanics.Taking Jinchuan No.2 mining area,a typical high in-situ stress mining area,as the background,this paper summarizes the in-situ stress distribution characteristics of the study area according to the previous measured data.On this basis,the discrete element numerical simulation method was used to calibrate the rock mechanical parameters based on the laboratory test of rock samples in the study area,and the tunnel models under three different in-situ stress conditions were established.According to the simulation results,the development process of roadway surrounding rock deformation under different conditions was described,the deformation failure characteristics of roadway in each model were compared,the influence of ground stress on roadway deformation failure was analyzed,and the corresponding control methods were proposed.The main conclusions of the study include:(1)Due to the influence of complex geological background,the distribution of ground stress in Jinchuan No.2 mining area is highly discrete.In the measured data,there are more than 80%of the measure points show that maximum horizontal principal stress is greater than the vertical principal stress,and the stress of primary rock is mostly horizontal.In shallow mining areas,the growth rate of horizontal stress is greater than that of vertical stress.With the increase of buried depth,the increment speed of horizontal stress gradually decreases,and the vertical principal stress gradually approaches the maximum horizontal principal stress.(2)Without the influence of structural pla

关 键 词：金川铜镍矿 高地应力 深部巷道 变形破坏 PFC 支护措施 

分 类 号：TD353[矿业工程—矿井建设]