Research On Soil Arching Effect Of Anti Slide Pile And Optimization Of Raw Piles

Landslide is one of the three major geological disasters, which widely distributes and frequently occurs. Large scale landslides damage is terrorist and easy to cause serious losses. The anti-slide pile is one of the most significant measures for preventing and controlling landslide. But the design of anti-slide pile is always so conservative and less considering influence of soil arching effect that the pile spacing is rather narrow, it is in waste of resources and funds. Therefore studying the soil arching effect and obtaining the layout optimization of anti-slide pile have profound significance. The more obvious the soil arching effect, the better effect of anti-slide. Meanwhile the soil arching effect is influenced by many factors. The detailed researches can be generalized as below:1) First of all, the characteristics of landslide and anti-slide pile, and the mechanism of soil arching effect were analyzed briefly. Then according to the formula for calculating the pile spacing derived by reseachers, six factors, including the pile length, pile spacing, soil property, Poisson’s ratio, interface parameters between pile and soil, and the landslide thrust, affecting the soil arching effect were determined. The plane strain finite element model was established based on PLAXIS,and the orthogonal test method was introduced to perform multi-factor and multi-level analysis of the six factors. And finally, under the static condition, the main and minor relationship of the above six factors and their optimal combination affecting soil arching effect for the single row pile were determined, and the single factor was analyzed.2) As the landslide thrust(uniform load) is large, it is necessary to consider the use of double row piles. Multi-factor and multi-level analysis of the above six factors for the double row piles were also performed under the static condition. The main and minor relationship of the above six factors and their optimal combination affecting soil arching effect for the double row piles were determined. Additonally,combined with the results of the single row pile, the main factors and the minor factors were ascertained.3) Based on the above static analysis of soil arching effect, the seismic dynamic analysis was performed simply which use the optimal combination of the single row pile and the double row piles model, and the results in the dynamic condition werecompared with those in the previous static condition. At the end, the time-displacement curve, the time-acceleration curve, the step-stress curve and the step-strain curve were analyzed and summarized.