含裂隙类岩石单轴压缩的数值模拟研究  

Numerical simulation study on uniaxial compression of fractured rocks

作　　者：高云龙 经纬[1,2,3] 经来旺 金仁才[3] 钱元弟 GAO Yun-long;JING Wei;JING Lai-wang;JIN Ren-cai;QIAN Yuan-di(School of Civil Engineering,Anhui University of Science&Technology,Huainan 232001,China;State Key Laboratory of Deep Coal Mining Response&Disaster Air Defense,Anhui University of Science&Technology,Huainan 232001,China;Civil Engineering Postdoctoral Research Workstation,China MCC17 Group Co.,Ltd.,Ma′anshan 243000,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]安徽理工大学深部煤矿采动响应与灾害防空国家重点实验室,安徽淮南232001 [3]中国十七冶集团有限公司土木工程博士后科研工作站,安徽马鞍山243000

出　　处：《河南城建学院学报》2023年第5期8-13,共6页Journal of Henan University of Urban Construction

基　　金：国家自然科学基金(51904012);安徽省教育厅高校自然科学研究重大项目(KJ2021ZD0053);深部煤矿采动响应与灾害防控国家重点实验室开放基金(SKLMRDPC19KF02);华能庆阳煤电有限责任公司宁正煤田大埋深超厚煤层沿空跟底掘进巷道关键支护技术研究项目(HNQMHTY-051-2022-JZ01);大柳煤矿有限公司“三软”煤层回采巷道支护技术研究科技项目(HNMYKJ19-04)。

摘　　要：为研究不同裂隙厚度和裂隙倾角的类岩石试件的力学特性,利用颗粒流离散元程序软件(PFC)对单轴压缩过程进行数值模拟并分析。结果表明裂隙倾角和厚度对类岩石试件的扩展规律和力学特性有较大影响。随着裂隙厚度和倾角的增大,裂纹主要从试件内部起裂,破坏由剪切破坏转变为剪切张拉复合型破坏。类岩石试件的弹性模量在线弹性阶段随着应力的持续施加,其增大的趋势逐渐减缓。线弹性阶段结束后,应力-应变曲线在到达峰值应力前的间距都是随着轴向荷载的持续施加而扩大,并且曲线斜率随着裂隙倾角的变大和厚度的减小而增大;当裂隙厚度相同时,峰值应力随着裂隙角度的增大而增大。数值模型工况不同,岩石试件抵抗外荷的能力也不同。在相同倾角条件下,试件的残余强度随着裂隙厚度的减少而增大,当厚度为0.3 mm、倾角为90°情况下,试件的残余强度最大。In order to study the mechanical properties of rock-like specimens with different crack thicknesses and crack inclination angles,the particle flow discrete element programming software(PFC)was used to numerically simulate and analyze the uniaxial compression process.The results show that the crack inclination angle and thickness have a great influence on the expansion law and mechanical properties of rock-like specimens.The cracks mainly started at the end of the specimen and expanded diagonally to both ends of the specimen.As the crack thickness and inclination angle increased,the cracks mainly started from the inside of the specimen,and the failure changes from shear failure to shear-tension composite failure.During the linear elastic stage,the elastic modulus of the rock-like specimen gradually slows down as stress continues to be applied.After the linear elastic stage,the distance between the stress-strain curve before reaching the peak stress increases with the continuous application of axial load,and the slope of the curve also increases with the increase of the crack inclination angle and the decrease of the thickness.When the crack thickness is the same,the peak stress increases with the increase of the crack angle.The ability of rock specimens to resist external loads is also different under different numerical model working conditions.Under the same inclination angle condition,the residual strength of the specimen increases as the crack thickness decreases.When the thickness is 0.3 mm and the inclination angle is 90°,the residual strength of the specimen is the largest.

关 键 词：单轴压缩 裂隙角度 裂隙厚度 裂纹扩展 数值模拟 峰值强度 

分 类 号：TU452[建筑科学—岩土工程]