为了研究水位升降对蚀变带边坡岩石力学性质的影响，选取仓上露天金矿坑边坡蚀变岩样，进行了不同饱水-失水循环次数的单轴压缩试验。建立了函数关系描述蚀变岩力学性质在水岩作用下的变化规律，引入损伤率的概念分析了循环次数对蚀变岩力学性质的影响，并利用电镜扫描技术从微观角度分析了水岩作用对蚀变岩的损伤机理。结果表明水岩作用对蚀变岩的力学性质有明显的弱化现象，且水岩作用越强，弱化现象越明显;不同循环次数下，蚀变岩弹性模量随循环次数增加衰减迅速，峰值强度呈持续衰减状态;随蚀变、碎裂发展，水岩作用对岩石的力学性质损伤增加，循环15次后，弹性模量损伤率最大接近60%，峰值强度接近45%。

In order to research the effect of water level fluctuation on the mechanical properties of slope rock at altered zones, we carried out uniaxial compression test on rock samples from open-pit slope in Cangshang under different saturation-dehydration cycles. Moreover, we established the function which describes the variation pattern of mechanical properties of altered rock under water-rock interaction. We also analyzed the influence of circulating times on the mechanical properties of altered rock through introducing the concept of damage rate. Besides, the damage mechanism of water-rock interaction on altered rocks was also analyzed by scanning electron microscopy(SEM). The result indicated that the mechanical properties of altered rocks were obviously weakened by water-rock interaction, and with the increase of water-rock interaction, the phenomenon was more obvious; with the increase of circulating times, the elasticity modulus decayed rapidly while the peak intensity was decaying continuously. As the degree of alteration and fragmentation increased, the degree of damage increased regarding the water-rock interaction to the mechanical properties of rock, and after fifteen saturation-dehydration cycles, the damage rate of elasticity modulus reached 60%, while that of peak intensity was 45%.