Study On The Influence Of Soil Arching Effect Parameters Affect Of Embedded Anti-slide Piles

As a new type of landslide support structure,embedded anti-slide piles are gradually applied to the treatment of landslides due to its unique structural form and unique support advantages.However,the working mechanism of embedded anti-slide piles and its current Engineering applications have not yet formed a consensus theory and specifications.In view of this,on the basis of summarizing and analyzing the previous research results,this paper establishes a three-dimensional numerical analysis model of the embedded anti-slide pile through the finite difference method software FLAC3 D,and studies the soil arch effect between the piles under static and dynamic conditions The influence of factors on the horizontal soil arch and vertical soil arch between piles and their laws,the research results can provide a theoretical reference for the actual anti-slide pile engineering.The main research contents and results are as follows:(1)The formation of horizontal soil arch effect between piles and its influencing factors are studied.The axis of horizontal soil arch between piles is parabolic,and the horizontal soil arch effect increases first and then weakens with the increase of the pile spacing,in the 2b ～ 4b pile The horizontal soil arch is the most obvious at a clear distance;through the study of external load changes,it can be seen that within a certain landslide thrust range,the horizontal soil arch gradually increases with the increase of landslide thrust.When the pile landslide thrust exceeds 3 times the soil cohesion When the value is reached,the stability of the horizontal soil arch begins to weaken;studying the influence of the soil parameters on the horizontal soil arch,the results show that the horizontal soil arch increases significantly with the increase of the soil cohesion and internal friction angle,and the cohesion The effect of horizontal soil arching is greater,and it is further obtained that the reasonable pile spacing of anti-slide piles increases with the increase of soil cohesion and internal friction angle;at the same time,with the increase of embedding depth,the horizontal soil arching effect between piles has increased.(2)The influence factors of the vertical soil arch between the piles are analyzed by numerical simulation.The results show that the vertical soil arch axis between the piles is a quadratic equation.As the distance between the piles increases,the vertical soil arch effect increases first and then weakens;Moreover,when the soil body between the piles is vertically formed,an appropriate external load is required to cause a large relative displacement of the pile and soil.When the thrust of the landslide behind the pile exceeds 2 times the value of the soil cohesion,the stability of the vertical soil arch gradually It was damaged;at the same time,it was found that the increase in soil cohesion and internal friction angle can significantly enhance the vertical soil arch effect between the piles and effectively suppress the vertical settlement of the soil.(3)By studying the dynamic characteristics of horizontal and vertical soil arches between piles,and comparing with the corresponding static soil arching effect,the results show that: under earthquake action,the horizontal soil arches between piles are weakened to varying degrees,while The vertical soil arch effect between the piles is enhanced under the action of earthquakes,and compared with the model of larger pile spacing,the seismic load has a smaller effect on the horizontal soil arch and vertical soil arch effects at smaller pile spacing.