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通过预制节理岩体试件,对不同节理倾角、节理贯通度、节理组数、饱和度、节理厚度、循环次数等6种情况进行冻融试验,并进行单轴压缩试验以研究其性质规律。研究表明:试样的表观形态、强度和破坏模式与冻融和节理有密切关系;冻融使节理处粘结强度严重降低,使试样产生损伤,损伤程度与冻融次数呈正相关,与饱和度、节理厚度在一定范围内正相关;节理数、节理倾角对试件强度的影响与非冻融试样有着相似的变化规律;非贯通冻融节理试样的破坏机理比较符合断裂力学理论;在整个过程中,冻融与节理相互作用共同促使试样损伤破坏。
Through prefabricated jointed rock specimen, freezing and thawing tests were conducted on six kinds of conditions including different joint inclination, joint penetration, joint number, saturation, joint thickness and number of cycles, and uniaxial compression tests were conducted to study their properties. The results show that the apparent morphology, strength and failure modes of the samples are closely related to the freeze-thaw and the joints. The freeze-thaw causes the bond strength of the joints to be severely reduced, resulting in damage to the samples. The degree of damage is positively correlated with the number of freeze- Saturation and joint thickness are in a certain range. The influence of joint number and joint inclination on the strength of specimens is similar to that of non-freezing and thawing specimens. The failure mechanism of non-through freezing and thawing joints is in good agreement with the theory of fracture mechanics During the whole process, the interaction between freezing and thawing and the joint jointly promote the destruction of the specimen.