FLAC^(3D)锚杆(索)拉伸-剪切破断单元的二次开发及数值实现  

Secondary development and numerical realization of FLAC^(3D)bolt(cable)tensile-shear fracturing unit

作　　者：孟庆彬[1,2] 宋子鸣 刘滨 李为腾[3] 王从凯[1] 辛学奎 MENG Qingbin;SONG Ziming;LIU Bin;LI Weiteng;WANG Congkai;XIN Xuekui(State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao,Shandong 266590,China)

机构地区：[1]中国矿业大学深地工程智能建造与健康运维全国重点实验室,江苏徐州221116 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [3]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590

出　　处：《采矿与安全工程学报》2025年第1期180-193,共14页Journal of Mining & Safety Engineering

基　　金：国家重点研发计划项目(2021YFC2902103);国家自然科学基金项目(52074268,51704280);中国博士后科学基金项目(2021T140708)。

摘　　要：FLAC^(3D)内嵌的Cable原始单元不具有拉伸或剪切破断失效属性,高估了锚杆(索)的支护能力及对巷道围岩的控制效果,存在巷道支护失效的安全隐患。为解决Cable原始单元无法实现锚杆(索)破断失效的问题,提出了锚杆(索)拉伸、剪切、拉剪破断判据;基于Fish语言构建了考虑拉伸、剪切及拉剪作用的修正Cable破断单元模型及数值分析流程,完成了FLAC^(3D)中锚杆(索)3种破断行为数值模拟的二次开发;开展了锚杆(索)破断模拟试验和锚喷支护巷道应用分析,修正的Cable拉伸-剪切破断单元模型的数值模拟试验结果符合预期,所开发的Cable破断单元模型兼有锚杆(索)拉伸和剪切破断的属性,较好地实现了拉剪荷载作用下锚杆(索)破断失效行为的模拟,数值模拟的锚杆(索)力学行为与工程实际更为相符。随着巷道埋深(应力水平)的增加,当锚杆(索)的变形量或受力状态达到其拉伸-剪切破断条件时,锚杆(索)则破断失效而无法再继续控制巷道围岩变形,锚杆(索)均有自身的支护适用性。Since the original Cable unit embedded in FLAC^(3D)does not have the properties of tensile or shear failure,the support ability of bolts(cables)and their control effect on roadway surrounding rock would be overestimated,posing potential safety hazard of roadway support failure.To address this problem,tensile,shear,and tensile-shear fracturing criteria of bolts(cables)were proposed here.Besides,a modified Cable fracturing unit model considering tensile,shear,and tensile-shear effects and the corresponding numerical analysis process were established with the aid of Fish language.On this basis,the secondary development of numerical simulation on the three fracturing behaviors of anchor bolts(cables)in FLAC^(3D)were completed.Finally,simulation on bolt(cable)fracturing and the application analysis on the bolt-shotcrete support roadway were conducted.The numerical simulation results of the modified Cable tensile-shear fracturing unit model are in line expectations.The established Cable fracturing unit model,which boasts the properties of tensile and shear fracturing,can well simulate the fracturing failure behaviors of bolts(cables)under tensile-shear load and make the simulated mechanical behaviors of bolts(cables)more consistent with engineering practice.As the buried depth(stress level)of the roadway increases,the deformation of bolts(cables)intensifies.When the deformation or stress state of bolts(cables)reaches their tensile-shear fracturing condition,the bolts and cables would fracture and fail,no longer being able to control the deformation of roadway surrounding rock.Bolts and cables have their own support applicability.

关 键 词：FLAC^(3D)二次开发 锚杆(索)破断失效 Cable破断单元 支护适用性 

分 类 号：TD325.4[矿业工程—矿井建设]