降雨雨型对滑坡影响的流固耦合数值分析

Study on effect of rainfall type on landslide by fluid-solid coupled numerical simulation

基于流固耦合理论和非饱和土强度理论,对降雨雨型对降雨型滑坡产生的影响进行了数值分析研究。结果表明,不同降雨雨型虽降雨量相同,但强度不同,对边坡孔隙水压力变化、分布和稳定性变化有重要影响;造成这种差异的根本原因为降雨量在整个降雨过程不同时段的集中程度不同。从安全的角度考虑,在进行边坡的稳定性分析时,在已知降雨量和降雨持时的条件下,建议采用线性递增型雨型来进行计算。

Based on fluid - solid coupled theory and unsaturated soil strength theory, numerical simulation is conducted to ex- plore the effect of rainfall type on landslide occurrence. The results show that though precipitation yield of different rainfall type is the same, the intensity is not; the rainfall type exerts a significant influence on variation and distribution of slope pore pressure and further on slope stability, the basic causes for these influences are the different concentration of rainfall distributed in the whole process. In the condition of same rainfall volume and duration, a linear increasing rainfall type is recommended for slope stability analysis to get a more guaranteed safety.