含初始损伤岩石的冻融损伤试验研究

Experimental Investigation on Freezing Damage Characteristics of Granite with Initial Damage

在实际工程中,岩石大多是含初始损伤的,分析含初始损伤岩石的力学性能有重要的工程意义。预先统计岩石试块的初始抗压强度,然后根据其抗压强度给岩石试块施加压力。分别施加了极限抗压强度的10%、30%、50%、70%、80%、90%,以形成不同的初始损伤。然后通过低温冻融实验和单轴压缩实验,将岩石在传统循环荷载作用后的损伤与低温冻融损伤进行比较,得出这两种损伤的异同点,建立了岩石材料在不同环境条件下的损伤表达式,研究了初始损伤对岩石冻融的影响,对今后估测含初始损伤岩石的冻融寿命有一定参考价值。

The rock is always initially damaged in the actual project, so it is necessary to study the me- chanical properties of the rock with initial damages, the initial compressive strength of the rock was ac- counted in advance, then the pressure containing 10 %, 30 %, 50 %, 70 %, 80 % and 90 % of the ultimate compressive strength were given to the rock. By the freeze-thaw cycle tests and uniaxial compression ex- periments, the damages of the rock in the traditional cyclic loading and after the low temperature freeze- thaw cycles were compared, the similarities and differences of these two damages were obtained, the rock damage model was established under different conditions, the influence of the initial damage on the behav- ior of risisting freeze-thaw was analyzed. The result can provide a reference value to the research of the freeze-thaw durability of the rock with initial damages.