金川矿区深部巷道开挖损伤数值模拟研究  

NUMERICAL SIMULATIONS OF EXCAVATION DAMAGE IN DEEP ROADWAYS OF JINCHUAN MINING AREA

作　　者：孙琪皓 马凤山[1,2] 万洋 郭捷[1,2] 李光[1,2] SUN Qihao;MA Fengshan;WAN Yang;GUO Jie;LI Guang(Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Innovation Academy for Earth Science,CAS,Beijing 100029,China;University of Chinese Academy of Sciences,Beijing 100049,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]中国科学院大学,北京100049

出　　处：《工程地质学报》2021年第4期1017-1027,共11页Journal of Engineering Geology

基　　金：国家自然科学基金项目(资助号:41772341,42072305,41877274,41831293)。

摘　　要：在地下深处开挖巷道会诱发应力的急剧调整,无疑会使围岩产生不同程度的损伤。开挖的动态作用虽然持续时间较短,但造成的损伤为后续时效变形和工程扰动影响下的失稳破坏提供了基础条件。为了能够得到开挖作用引起的金川矿区深部巷道损伤区演化规律,从而对巷道损伤破坏进行针对性的防治,本文基于矿区的实际巷道埋深和岩体结构种类,采用等效开挖模拟方法和非均质模型进行了巷道开挖损伤问题的数值模拟研究。模拟结果揭示了在不同水平和岩体结构条件组合情况下开挖损伤区的演化过程和规律。根据研究区巷道的损伤破坏规律,本文提出了深部巷道开挖损伤演化的5种模式,并揭示了各种模式的诱发条件、表现特征、力学机制及发展趋势。相关认识和结论期望为理论和工程实践提供一定的借鉴和参考。Excavation of roadways in deep underground can induce the sharp adjustment of stress,which can undoubtedly cause the damage of surrounding rock.Although the dynamic action of excavation lasts for a short time,the damage caused by excavation provides the basic conditions for subsequent instable failure and disaster phenomena under time-dependent deformation and engineering disturbance.In order to obtain the evolution mechanism of excavation-induced damage in deep roadways and take targeted prevention and control measures in Jinchuan mining area,the equivalent simulation method and heterogeneous model are adopted based on the actual buried depth and rock mass structure types to study excavation damage problems.The simulation results reveal the evolution process and law of excavation damage zone under different levels and rock mass structures.According to the damage and failure law of roadways in the study area,this paper puts forward five evolution models of excavation damage in deep roadways,and reveals the inducing conditions,performance characteristics,mechanical mechanisms and development trends.Relevant understanding and conclusion are expected to provide certain reference for theory and engineering practice.

关 键 词：开挖损伤 深部 巷道 离散元 演化模式 

分 类 号：TD853[矿业工程—金属矿开采]