含交叉裂隙节理岩体单轴压缩破坏机制研究  

Uniaxial compression failure mechanism of jointed rock mass with cross-cracks

作　　者：张波[1,2,3] 李术才[1,3] 杨学英[4] 王刚[2] 张敦福[1] 杨为民[3] 李景龙[1,2] 

机构地区：[1]山东大学土建与水利学院,济南250061 [2]山东科技大学山东省矿山灾害预防控制国家重点实验室培育基地,山东青岛266590 [3]山东大学岩土与结构工程研究中心,济南250061 [4]山东城市建设职业学院工程管理系,济南250014

出　　处：《岩土力学》2014年第7期1863-1870,共8页Rock and Soil Mechanics

基　　金：国家自然科学基金面上项目资助(No.51379114;51279095);山东省自然科学基金青年基金资助(No.ZR2012EEQ007);山东省矿山灾害预防控制国家重点实验室培育基地(山东科技大学)开放基金资助(No.MDPC2012KF04;No.MDPC2012KF07);岩土力学与工程国家重点实验室开放基金(No.Z013004)

摘　　要：对含交叉裂隙相似材料试件进行单轴压缩试验,用Abaqus对含交叉裂隙节理岩体进行应力分析,研究了含交叉裂隙节理岩体单轴压缩下的破坏机制。结果表明:交叉裂隙的主裂隙与加载方向呈30°、45°时,主裂隙是裂隙扩展及破坏的控制裂隙,此时含交叉裂隙岩体强度高于含单向裂隙岩体,是由于主裂隙裂尖最大环向应力σθmax低于单向裂隙;主裂隙与加载方向呈0°或90°时,次裂隙是控制裂隙;主裂隙与加载方向呈0°时,大部分次裂隙裂尖σθmax及裂尖最大应力强度因子KⅡmax高于单向裂隙,因此,此时大部分含交叉裂隙岩体强度低于含单向裂隙岩体;在主裂隙与加载方向呈90°工况组中,主、次裂隙夹角为45°时,次裂隙裂尖KⅡmax最大,所以此工况组中此时强度最低。The uniaxial compression failure mechanism of jointed rock mass with cross-cracks was studied through similar material uniaxial compression tests and numerical computation with Abaqus. The study results show that when the angle between the main crack and loading direction is at 35° or 45°, the main crack is the key crack of crack propagation and rock mass failure. At these cases the strength of rock mass with cross-cracks is higher than that of rock mass with single crack. The reason is that the maximum hoop stressσθmax of main crack tip is less than that of single crack. When the angle between the main crack and loading direction is at 0°or 90° the secondary crack is the key crack of crack propagation and rock mass failure. When the angle between the main crack and loading direction is at 0° the maximum hoop stressσθmax and the maximum stress intensity factor KⅡmax of most secondary cracks are higher than those of single crack. So at these cases the strength of rock mass with cross-cracks is lower than that of rock mass with single crack. The KⅡmax of the case with 45° between main crack and secondary crack is the maximum stress intensity factor in those cases that the angle between the main crack and loading direction is at 90°. So the strength of rock mass with 45° between main crack and secondary crack is the lowest one in this case group.

关 键 词：节理岩体 交叉裂隙 破坏机制 起裂模式 相似材料 

分 类 号：TD315[矿业工程—矿井建设]