考虑水岩物理化学作用的库岸堆积体边坡稳定性研究——以金沙江下咱日堆积体为例

 以金沙江下咱日堆积体为例，阐述在考虑水岩物理化学作用的情况下，如何利用大型原位推剪试验求取堆积体天然状态下和与库水反应后的力学参数c，j值，并利用所求得的参数建立随库水位上升时边坡稳定性计算的数值模型。通过计算得出：在只考虑水岩力学作用和考虑水岩力学、物理化学作用2种情况下，边坡的稳定系数随库水位上升的变化趋势是一致的，都是先减小，后升高，但是后者的稳定系数比前者有相当程度的降低，下降程度可以达到35.34%，甚至更多。所以，在实际的工程应用中只考虑水岩力学作用计算出来的稳定系数是不可靠的，误差非常大。

STABILITY STUDY ON RESERVOIR ACCUMULATION BODY CONSIDERING PHYSICAL AND CHEMICAL REACTIONS BETWEEN WATER AND ACCUMULATION BODY-TAKING XIAZANRI ACCUMULATION BODY FOR EXAMPLE

Taking Xiazanri accumulation body for example，the parameters of accumulation body under natural situation and after physical and chemical reactions with reservoir water are obtained using large-scale horizontal push-shear in-situ test. Based on these parameters，numerical model to calculate the safety factor of reservoir accumulation slope is built. The results show that under two situations(with/without considering chemical and physical reactions between water and accumulation body)，the changing trend of safety factor of slope is the same as the reservoir water level ascends，which decreases at first and then increases. However，compared with the former，the factor of safety under the latter situation decreases more，and decreasing ratio can reach 35.34% or more. Therefore，factor of safety calculated only considering the water-rock mechanical reaction is not reliable in practical engineering design.