CAJ | 학술논문

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。
대함교차렬극상사재료시건진행단축압축시험，용Abaqus대함교차렬극절리암체진행응력분석，연구료함교차렬극절리암체단축압축하적파배궤제。결과표명：교차렬극적주렬극여가재방향정30°、45°시，주렬극시렬극확전급파배적공제렬극，차시함교차렬극암체강도고우함단향렬극암체，시유우주렬극렬첨최대배향응력σθmax저우단향렬극；주렬극여가재방향정0°혹90°시，차렬극시공제렬극；주렬극여가재방향정0°시，대부분차렬극렬첨σθmax급렬첨최대응력강도인자KⅡmax고우단향렬극，인차，차시대부분함교차렬극암체강도저우함단향렬극암체；재주렬극여가재방향정90°공황조중，주、차렬극협각위45°시，차렬극렬첨KⅡmax최대，소이차공황조중차시강도최저。
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.