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为了研究水岩作用对蚀变岩劣化破坏的损伤机理,选取某边坡蚀变岩样为试验对象,对不同饱和-失水次数的蚀变岩进行了岩石力学试验。建立了数学关系式来表达水岩作用对蚀变岩力学性质的劣化规律,借助损伤率的概念分析了循环次数对蚀变岩力学性质的损伤作用。试验结果表明:在水岩作用下蚀变岩的力学性质产生了明显的劣化现象,随着循环次数的增多劣化效果越明显;当岩石的蚀变风化程度相同时,抗拉强度劣化程度最大,弹性模量次之,单轴抗压强度最小;在不同饱和-失水循环次数下,蚀变岩抗拉强度、弹性模量随次数的增加迅速减小,单轴抗压强度出现持续减小的现象;蚀变、风化程度越高的岩石对水岩作用表现出越强的敏感性,随着饱和-失水循环次数的增加,蚀变岩的劣化现象趋于稳定,抗拉强度的损伤率最大达到63%,弹性模量60%,单轴抗压强度48%。
In order to study the damage mechanism of water-rock effect on the alteration and deterioration of altered rock, rock alteration samples from a slope were selected as test objects to conduct rock mechanics tests on altered rocks with different saturation-loss times. Mathematical relation was established to express the effect of water and rock on the mechanical properties of altered rock. The damage effect of cyclic number on the mechanical properties of altered rock was analyzed by the concept of damage rate. The experimental results show that the mechanical properties of alteration rock under water rock cause obvious deterioration phenomenon, the more obvious the deterioration is. With the same degree of alteration and weathering, the degradation degree of rock tensile strength is the highest, The elastic modulus is the second, and the uniaxial compressive strength is the smallest. Under the different saturation-loss cycles, the tensile strength and the elastic modulus decrease rapidly with the increase of the times, and the uniaxial compressive strength decreases continuously The rock with higher alteration and weathering shows more sensitivity to water-rock interaction. With the increase of saturation-loss cycles, the deterioration of alteration rock tends to be stable and the tensile strength The maximum rate of 63%, the elastic modulus of 60%, uniaxial compressive strength of 48%.