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运用岩石破裂过程分析系统(RFPA2D),结合室内实验研究了预置双裂隙试样在不同岩桥倾角影响下的破坏过程及裂隙的贯通机理。对单轴加载下岩桥断裂特征的研究表明:随着岩桥倾角(0°~90°)的增加,贯通模式呈现由压剪混合贯通过渡到剪切贯通最后到拉伸贯通的趋势。从贯通强度和能量的角度,分析了岩桥倾角分别为0°、30°、60°、90°下的贯通模式,研究了岩桥长度、非均匀性对裂纹扩展的影响。结果表明:岩桥倾角为0°时,贯通强度最高;岩桥倾角为60°时,贯通强度最低;随着岩桥长度(8mm~42mm)的增加,贯通由简单模式过渡到复杂贯通最后到未贯通;当均匀性系数较小(m=3),即均匀程度较低时,裂纹往往沿着强度较弱的部位进行扩展,裂纹路径较为曲折;当均匀程度较高时(m=7、m=15),主裂纹路径较为集中,宏观上表现为越来越光滑。
Using the Rock Failure Analysis System (RFPA2D), combined with laboratory experiments, the failure process and fracture mechanism of the prefabricated double-fractured specimen under the influence of rock slope inclination were studied. The study on the characteristics of rockfill break under uniaxial loading shows that with the inclination of rock bridge (0 ° ~ 90 °) increases, the through-flow pattern shows the transition from pressure-shear mixing through to the shear through to the final through-stretch. From the perspective of penetration strength and energy, the through mode of rock bridge with dip angle of 0 °, 30 °, 60 ° and 90 ° is analyzed respectively. The influence of rock bridge length and inhomogeneity on crack propagation is studied. The results show that the penetration strength is the highest when the inclination of rock bridge is 0 °, and the lowest is the penetration strength when the inclination of rock bridge is 60 °. With the length of rock bridge (8mm ~ 42mm), the transition from simple mode to complex through (M = 3), that is, when the homogeneity is lower, the crack tends to expand along the weaker part, and the crack path is more tortuous. When the uniformity is high (m = 7, m = 15), the main crack path is more concentrated, macroscopically more and more smooth.