针对动力荷载下软硬互层岩体破坏问题,以汶川水磨沟滑坡层状岩体为研究对象,依据相似理论,制作软硬互层岩质试块,开展单轴压缩及变上下限等幅值循环荷载试验,研究其动力特性及破坏过程。结果表明:随岩层倾角的增大,其破坏模式为贯通层面的张拉破坏(0°~30°)、沿层面的剪切破坏(45°~75°)及沿层面的劈裂破坏(90°),而试样的强度及应变先增后减。对于相同倾角的试样,强度随加载频率及围压增大而增大。应变随加载频率增大而减小,随围压增大而增大。加载频率的增大会导致竖向拉张裂缝贯通、破裂程度降低。
Abstract
This study investigates the failure behavior of soft-hard interbedded rock mass under dynamic loading conditions in the Shuimogou landslide area of Wenchuan, using soft-hard interbedded rock specimens created according to the similarity theory. Cyclic loading tests involving uniaxial compression and variable upper and lower limits were carried out to explore the dynamic characteristics and failure process of the specimens. The results show that the failure modes include tensile failure (0°-30°), shear failure (45°-75°), and cleavage failure (90°), depending on the dip angle of the rock layer. For specimens with the same inclination angle, strength increases with loading frequency and confining pressure, while strain decreases with the former but increases with the latter. In addition, higher loading frequency leads to the transfixion of vertical tension cracks and the decrease of fracture degree.
关键词
动力特性 /
循环荷载试验 /
软硬互层岩体 /
水磨沟滑坡 /
单轴压缩
Key words
dynamic characteristic /
cyclic loading test /
soft-hard interbedded rock mass /
Shuimogou landslide /
uniaxial compression
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