台风暴雨型浅层滑坡失稳机理研究

针对台风暴雨耦合作用下浅层滑坡的失稳机理进行研究。在总结福建台风暴雨型滑坡灾害特征的基础上，提出风荷载对斜坡变形失稳的影响机理是通过植被造成坡体开裂，从而影响坡体的入渗规律。应用GeoStudio软件计算台风暴雨入渗条件下裂隙坡体中暂态非饱和渗流场的变化，以及对斜坡稳定性的影响。计算结果表明:裂隙坡体由于在裂隙处形成集中入渗点，雨水的入渗速度大于无裂隙的坡体，坡体达到饱和状态所需要的时间大为缩短。裂隙深度、间距对滑坡稳定系数的影响较大，裂隙深度越大、间距越小，在相同的降雨条件下滑坡的稳定系数越小，滑坡失稳需要的降雨时长越短。裂隙宽度对滑坡稳定性的影响相对较小。 

Study on instability mechanism of shallow landslide caused by typhoon and heavy rain

The instability mechanism of shallow landslide under the coupling of typhoon and heavy rain is studied. On the basis of summarizing the disaster characteristics of landslides caused by typhoon and heavy rain in Fujian, it is proposed that the influence mechanism of wind load on slope deformation and instability is that the slope body is cracked by vegetation, which affects the slope infiltration law. GeoStudio software was used to calculate the changes of transient unsaturated seepage field in the cracked slope body under the condition of typhoon storm infiltration, and to study the effect on the slope stability. The calculation results show that, due to the formation of concentrated infiltration points at the cracks, the infiltration rate of rainwater is greater than that of the unslitted slopes, and the time required for the slopes to reach saturation is greatly shortened. The depth and spacing of cracks have a greater impact on the stability coefficient of landslides. The greater the depth of cracks and the smaller the spacing, the smaller the stability coefficient of the landslide under the same rainfall conditions, and the shorter the rainfall duration required for landslide instability. The effect of crack width on landslide stability is relatively small.