【摘要】 针对震后边坡岩体在降雨或库水浸泡作用下易出现变形破坏的现状,选取典型砂岩为研究对象,对岩样先进行循环加卸载损伤作用,再进行浸泡–风干循环水岩作用试验,对损伤砂岩在水岩作用下的劣化效应和机制进行详细研究。结果表明:(1)循环加载作用导致的岩石矿物颗粒界面滑移、局部接触变形和破坏不仅使得岩样产生塑性变形,而且使得岩样内部形成初始损伤;(2)在浸泡–风干循环水岩作用过程中,损伤砂岩的抗压、抗剪强度劣化效应明显,具有明显的时间效应和非均匀性;(3)与完整岩样相比,损伤岩样的强度劣化速度更快,说明水岩作用对损伤岩样的耦合损伤效应明显,这也能较好解释一些震后边坡在经历多个浸泡或者降雨周期后容易失稳的原因。更多还原

【Abstract】 In view of the case that the slope rock mass after earthquake was frequently destroyed under the condition of rain or immersion for reservoir,typical sandstone was chosen as the research object to test under the condition of cycling loading and unloading first and circulating soaking-drying. Besides,the degradation mechanism of the sandstone was studied at length. The experiment results show that:(1) The plastic deformation and internal damage of rock were not only caused by slippage of mineral grains surface but deformation and failure of local contact in cycling loading and unloading;(2) The degradation of compressive strength and shearing strength was obvious in process of circulating soaking-drying which showed obvious time effect and heterogeneity;(3) Compared with the complete sample,the degradation speed of damage rock sample is faster,which means coupling damage effect of damage rock is obvious and can better explain why some slope after earthquake were instability under several times of cycling soaking-drying and raining.更多还原