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降雨是滑坡地质灾害的主要诱发因素之一,尤其是对于土质滑坡,连续的降雨能够使得土质滑坡浅表层滑体迅速饱和形成暂态饱和区,从而导致浅表层土质滑体的基质吸力降低,引起浅层滑动,而反映土体中暂态饱和区变化的主要指标为土体体积含水量。该文选取某一降雨诱发型土体滑坡为例,采用Geo-slope软件模拟连续降雨6d条件下土质浅层滑体内的暂态饱和区变化情况,并分析由滑坡后缘至前缘4个靠近地表(深度小于5m)点的体积含水量变化趋势以及连续6d降雨过程中浅层滑体的稳定性变化趋势,提出了降雨入渗过程中土质滑坡发生浅层滑动的体积含水量变化模式。
Rainfall is one of the main inducing factors of landslide geological disasters. Especially for the soil landslide, continuous rainfall can make the shallow landslide of soil landslides rapidly saturated to form transient saturated zone, which leads to the decrease of the matrix suction of the shallow landslide, Shallow sliding, while the main index reflecting the change of transient saturated zone in soil is soil volumetric water content. Taking a rainfall-induced soil landslide as an example, Geo-slope software was used to simulate the transient state of saturated soil in shallow soil under 6 days of continuous rainfall. The trend of volumetric water content at the surface (less than 5m in depth) and the trend of the stability of shallow landslides in the course of 6 days of continuous rainfall were put forward. The change pattern of volumetric water content of shallow landslides occurred during rainfall infiltration was proposed.