| The natural disasters on loess landslides in Tongchuan have been becoming more and more serious, which impose a great barrier to the sustainable economic development of the region. So the systematically study of loess landslides are emergently needed. Based on detailed investigation and survey of characteristics of environmental geology, engineering geology, hydrometeorology in Tongchuan, the distribution characteristic and the outer, inner factor of loess landslides are studied; and it is concluded that the rainfall and artificial engineering activity are the leading causes of loess landslide among various factors. Through plenty of tests of soil samples, it is researched that the loess's physical mechanics characteristics, the loess landslide's formation mechanism and kinematics mechanism. The relationship between coefficient (AD,BD) of pore water pressure and degree of saturation, as well as between porous ratio, is regressed using the non-liner regression. With the relations between shear strength of soil of slip band and water content, porous ratio, it is illustrated that the low velocity mechanism of the loess landslides in Tongchuan. And it is concluded that the gradually recovery of shear strength is an important factor of reducing the velocity of the landslides during the sliding process. New slopes stability analysis method in Tongchuan are offered, that is the fuzzy information optimization method, then taking example for Liecai road tollgate landslide, the method is contrast with limit equilibrium method and 2D FEM stability analysis. Finally, on the basis of the characteristics of loess landslides in Tongchuan, the meaning of landslide prevention and cure is illustrated, and the prevention and cure tactics of landslide is summarized. And besides, the engineering schemes to I , II landslides are offered.
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