中文摘要：

水库蓄水运行后,库水位反复升降变化对库岸边坡岩土体来说是一种疲劳作用,水岩作用下边坡岩体力学性质的劣化将影响整个边坡的稳定。基于此,在前期浸泡-风干循环水岩作用试验数据分析基础上,根据水岩作用过程中砂岩三轴压缩试验应力-应变曲线的特点,借助连续损伤力学和统计理论,将浸泡-风干循环水岩作用的损伤效应耦合到损伤统计本构模型中,并重点考虑了压密段的影响,分段建立了水岩作用下砂岩的统计损伤本构方程。对比分析表明,所建立的分段统计损伤本构模型计算与试验曲线符合较好,说明所建立的统计损伤本构方程可以较好地反映砂岩在浸泡-风干循环水岩作用的损伤效应,在水岩作用过程中,本构模型第2段的Weibull分布参数m和F_0均逐渐减小,反映了水岩作用下砂岩脆性逐渐减弱,宏观强度逐渐降低的力学特性。研究成果对大量存在的库岸边坡长期变形稳定分析具有较好的参考价值,同时,相关分析方法也可以为类似试验提供参考。

英文摘要：

After the impoundment and operation of reservoirs, the repeated change of water level has ＂fatigue effect＂ on the rock mass of the reservoirs slope, and the deterioration of the rock mass under water-rock interaction will affect the stability of the whole slope. Based on these, we acquired the following results on the foundation of the trial data analyses of the immersion-air dry cycle water-rock interaction in earlier stage. According to the characteristics of stress-strain curve acquired in the process of triaxial compression test under the water-rock interaction, and in virtue of continuum damage mechanics and statistical theory, the damage effect of the immersion-air dry cycle water-rock interaction is coupled into the damage statistical constitutive model. The damage constitutive equation of sandstone under water-rock interaction is established by considering the influence of compacted section. Comparative analysis reveals that the calculated curve based on the established sectional statistical damage constitutive model conforms well to the trial curve, which means the statistical damage constitutive model can accurately reflect the damage effect of sandstones under the immersion-air dry cycle water-rock interaction. In the process of water-rock interaction, the constitutive model parameters m and F0 all diminish gradually, which reflect the mechanical characteristics of sandstones that the brittleness weakens and the macroscopic strength reduces gradually. The results of the study can be used as a reference for long-term deformation stability analysis of a large number of existing bank slopes, and the correlation analysis method can also provide reference for similar experiments.