| The anti-slide pile is one of the most significant measures for controlling the accumulation landslides and is widely used in the landslide control project. But there are gaps between the theory study and the practical engineering. The common designed theories of anti-slide pile use many assumptions and can not consider the pile-soil interaction. Besides, the common designed theories of anti-slide pile is difficult to keep with the practical stress of anti-slide pile when analyze the complex the anti-slide system. Especially the common designed theories can not consider the soil arching effect and it is much blank needing to study. There is pressure on carrying out research on the mechanism of soil arching effect anti-slide piles and pile-soil interaction.The paper analyzed the mechanism of pile-soil interaction and discussed the advantages and disadvantages of anti-slide pile design today. Building the numerical simulation model on the basis of the study on the characteristics of accumulation landslide, and computing the effect of different factors toward soil arching effect, s. The main conclusions are as follows:(1) Analyzing the distribution situation and the composed elements of accumulation landslide, and summarizing the previous achievements about the ten basic characteristics of.accumulation landslide and compute methods of pushing force of sliding mass. Finally, the anti-side pile design procedure is introduced.(2) Describing the study results of present scholars about soil arching effect behind the piles and the soil arching effect between the piles and giving the maximum pile interval model. Providing the scientific calculation formula for the pile interval basing on the soil arching effect and summarizing the model of minimum pile interval and the maximum pile interval.(3) Building the numerical simulation model of pile-soil interaction in accumulation landslide using the finite element numerical simulation software basing on the study of accumulation landslide characteristics. Discussing the different factors about soil arching effect and building the different models about the different pile intervals, the different pile widths. Studying the influences of the different factors for soil arching effect and the characteristics of soil arching effect. Finally, analyzing the influences of the different factor for pile-soil load sharing ratio. The main study results are as follows:①According the numerical simulation of different pile interval, it can conclude that the soil displacement is increasing along the slip direction and soil arching height is raise up when the pile interval is growing larger. The changes of soil arching effect can be divided five parts from the behind to front of the pile. The y direction strain of the five parts reflects the changes of soil arching effect. When the pile interval is larger, the x direction stress reaches the maximum with the distance is larger to piles, when the pile interval reaches certain value, the soil arching height is not aggrandizing. The soil load sharing ratio about front of the pile is the proportional relation to the pile interval.②According the numerical simulation of different pile width, it can conclude that the soil arching height and influence scope are no change. The soil displacement is decreasing along the slip direction when the pile width is increasing. The soil load sharing ratio about front of the pile is increasing as the pile width is increasing, but the change of the soil load sharing ratio is small when pile width is above2meter.(4) Based on the numerical simulation model of pile-soil interaction in accumulation landslide. Building a model whose pile section is2mx3m and the different pile interval is8m. Discussing the different factors about soil arching effect and building the different models about the different pushing force of sliding, the different pile-soil interface parameters, the different soil poisson ratio, the different soil cohesion, the different soil internal friction angle, the different soil deformation modulus and analyzing the influences of the different factor for pile-soil load sharing ratio. The main study results are as follows:①According the numerical simulation of different pile width, it can conclude that the soil displacement is increasing when the pushing force is increasing. The soil arching can’t form when the pushing force is small. The value of pushing force can not affect the soil arching height.②The soil arching effect is less affected by the change of the friction coefficient. The aggrandizement of friction coefficient is less change to landslide displacement. The soil load sharing ratio about front of the pile is the proportional relation to the value of pushing force.③According the numerical simulation of different poisson ratio, it can conclude that the soil displacement is increasing when the poisson ratio is increasing, but the soil arching height is less change. The soil arching is parabola-shape when the poisson ratio is small. The soil arching is triangle when the poisson ratio is big. The poisson ratio sensitive area is0.4to0.45, because the soil load sharing ratio is largely increasing in this range. It shows that the soil arching effect is markedness when the poisson ratio is in the range of0.4to0.45.④The change of cohesion and internal friction angle are less change to the soil arching effect. The soil displacement is decreasing along the slip direction when the cohesion and internal friction angle are less increasing. There is a sensitive area of cohesion and internal friction angle to soil arching effect. The sensitive area of cohesion is in OkPa to10kPa and internal friction angle is0°to15°. The sensitive area of cohesion and internal friction angle are largely change to soil arching effect and the soil load sharing ratio.⑤The change of elastic modulus is less change to the soil arching effect and stress field and is largely change to the displacement. The soil load sharing ratio is decreasing when the elastic modulus is increasing.(5) Some advices are proposed based on the foregoing study:①The anti-pile can not completely stop the force transfer and the anti-slip effect is react when the pile interval is less12m. It can calculate the pile interval according to the curve of soil load sharing ratio with different pile②The model whose pile section is2mx3m and the pile interval is8m. The soil load sharing ratio about front of the pile has slight change when increases the pile width. So it is important to choose a suitable pile width in the anti-sliding engineering.③The soil load sharing ratio about front of the pile is the proportional relation to the value of pushing force. The load which anti-slip pile and soil arch bear is not fixed in the anti-sliding engineering. So this phenomenon can provide some suggestions for practical anti-pile design.④The soil load sharing ratio about front of the pile has slight change when increases the pile-soil interface parameters, so it is not important to the pile-soil interface parameters. The soil deformation modulus is important, because the soil deformation modulus is sensitive to the deformation. The pushing force of sliding, the soil poisson ratio, the soil cohesion, the internal friction angle have a sensitive area. If the pushing force of sliding is0.4to0.45, the soil poisson ratio is0°to15°and the soil cohesion is OkPa to20kPa, the safety factor should be increased. |
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