MODEL EXPERIMENTS FOR DEFORMATION AND FAILURE MECHANISM OF TYPHOON INDUCED LANDSLIDE

This paper analyzes the geological hazards induced by typhoon in Wenzhou. The landslide with arbor was most typical. Physical model experiments well reappear the the slope deformation-failure process caused by typhoon. The connection of failure phenomena between bare and arbor slope was analyzed after the induction and summarization on the characteristics of deformation and failure. Then a comprehensive analysis is made. The deformation and failure mechanism of typhoon landside is initially obtained. The results show that the slope is more likely to be damaged coupling typhoon with arbor after soil is softened by stronger rainfall. The main actions of typhoon to slope are the rain wash and softening caused by rainstorm with dynamic effect of gale, which is significantly different from general landside. When arbor roots are above the sliding zone, the roots go against the stability of slope under typhoon calamity. Soil mass failure may be caused in slope front areas. A phenomenon of wind liquefaction is found in the model testing. The reason is that soil liquefaction is formed with the cyclic loading of fluctuating wind to soil around root. It aggravates the wind throw of trees, makes the slope destruction complicated. Therefore, the deformation and failure mechanism of typhoon landslide is summarized asthe rain washsoil softeningwind actionarbor swingingsoil looseningcrack developmentfront soil failurelandslide formation.