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降雨、蒸发、库水位升降引起的水位变化是诱发滑坡的主要因素,在室内三轴试验中,现场应力路径很难被精确地模拟。以三峡库区千将坪滑坡为工程背景,通过室内非饱和土恒荷载试验(DL)模拟滑动带中非饱和土由水位变化导致吸力变化的应力路径,探讨水位变化对非饱和土体强度特性的影响。恒荷载试验结果表明:非饱和土在相同基质吸力条件下吸湿过程对应的抗剪强度高于脱湿过程,解释了千将坪滑坡延迟于强降雨和三峡水库第一期蓄水二个月后发生的原因。
Changes of water level caused by rainfall, evaporation and reservoir water level rise and fall are the main factors that cause landslide. In the indoor triaxial test, it is difficult to accurately simulate the site stress path. Taking the Qianjiangping landslide in the Three Gorges Reservoir as the engineering background, the stress path of the suction change caused by the water level change was simulated by indoor unsaturated soil earth load test (DL) to simulate the strength characteristics of unsaturated soil Impact. The results of constant load test show that the corresponding shear strength of unsaturated soil in the process of moisture absorption under the same substrate suction is higher than that of the desorption process, which explains that the Qianzhaoping landslide is delayed after heavy rainfall and two months after the first phase of the Three Gorges Reservoir What happened.