Study On The Mechanics Of Static Liquefaction In Slopes With Loose Silty Sand Under Rainy Condition

The liquefaction of the slope is a kind of geologic hazards. The landslide with static liquefaction is sudden, wide-range and disastrous, which usually destroys engineerings, ruins buildings, break off the traffic and threatens people's lives and properties seriously. Therefore, the study of static liquefaction in loose silty sand slope is necessary,so as to reveal the mechanics of static liquefaction for the purpose of controlling or predicting the geological disasters. The factors that influence the slope liquefaction are complicated. Based on the model experiments, this paper mainly studies the effects of fine content on the mechanics of static liquefaction in slope with silty sands under rainy condition. In order to complement the room laboratary experiment, this study uses the software Seep/W and Slope/W to simulate the seepage process and the slope safety separately.Firstly, the paper studies the mechanics of static liquefaction in slope with silty sands under artificial rainfall condition based on two 20% fine content. Then, compared with tests of the 10% and 0% fine content, it is concluded that the higher the fine content, the more susceptibility of the slope to liquefaction. Finally, conclusions could be drawn in the following: (1)The slope with no fine content couldn't be liquefied. The damage process is slow and the sand fall off from the upper to the lower positions. (2) Although the destroying of the 10% fine content slope is quicker, the whole process is smooth. The destroyed sand flow from the gully downward to the bottom of the model. In this experiment, the excess pore pressure doesn't happen. (3)The damage process of the 20% fine content slope is based on the critical time when the gully appears in the slope crest. With the development of the gully, the shallow sands in upper slope suddenly collapse. In the process, excess pore pressures are recorded and the slope is liquefied. The results could provide theoretical evidence for preventing or controlling this type of landslides.