Research On Reasonable Reinforcement Method Of Circular Cross Section Anti-slide Pile

China is a mountainous country with frequent occurrences of landslides and geological disasters.As one of the important structural forms to prevent landslides,anti-slide piles play an important role in the process of landslide treatment.As a method of anti-slide piles,circular cross-section anti-slide piles use mechanical hole formation,which can not only shorten the construction period,but also effectively avoid the risks of manual digging,which has important research significance.At present,there are mainly three types of reinforcement methods for circular cross-section anti-slide piles(uniform reinforcement along the circumference,non-uniform reinforcement along the circumference,and rectangular reinforcement cage).Based on finite element numerical simulation software,this paper quantitatively analyzes the landslide effect of circular cross section anti-slide pile with three reinforcement methods.Numerical simulation studies under static and seismic dynamic loads were carried out.Through comprehensive analysis of its force characteristics,antisliding effect and other aspects,the reinforcement method of circular cross-section anti-slide piles is suggested,which can provide reference for the design of circular cross-section antislide piles.The main conclusions obtained in this paper are as follows:(1)Under the action of static load,the positions of the first damage cracks in the three kinds of reinforcement methods of anti-slide piles are the same,but when the damage points appear for the first time,the rectangular steel cage anti-slide piles and the circular nonuniform distribution Reinforced anti-slide piles can bear more load;under the action of dynamic load,the concrete damage value of the rectangular steel cage anti-slide pile is the lowest.(2)Under the same level of static load,the displacement of the slope toe and the pile body of the landslide model supported by the rectangular steel cage anti-slide pile is relatively the smallest.The supporting model of circular non-uniformly reinforced anti-slide piles is second,and is close to the effect of rectangular steel cage anti-slide piles;under dynamic load,the landslide top,toe and toe of the landslide supported by rectangular steel cage anti-slide piles The final displacement of the pile is the smallest.(3)Under the action of static load,the longitudinal reinforcement on both sides of the neutral axis of the circular uniformly reinforced anti-slide pile section fails to fully play its role,while the circular non-uniformly reinforced anti-slide pile can better exert its longitudinal stress.The effect of the reinforcement,the tension and compression side reinforcement of the rectangular reinforcement cage are more uniform,and the overall force effect is relatively good.Under the action of dynamic load,the effect of circular nonuniformly reinforced anti-slide piles is relatively poor,while the overall effect of circular uniformly reinforced anti-slide piles and rectangular steel cage anti-slide piles is relatively better.The reinforcement of circular uniform reinforced anti-slide pile is the largest,rectangular steel cage anti-slide piles take the second place,and circular non-uniformly reinforced anti-slide piles have the least.(4)From the comprehensive consideration of force characteristics,displacement characteristics and convenience of construction,it is recommended that non-seismic fortified areas or areas of seismic fortified areas with less seismic intensity.Under the condition of accurate positioning,when the amount of reinforcement is not large,use a row of When the reinforcement can meet the bearing capacity requirements,it is more appropriate to use circular non-uniform reinforcement.When the landslide thrust is large and multiple rows of reinforcement are required,the circular section anti slide pile with rectangular reinforcement is more conducive to the arrangement of reinforcement.It is suggested that the circular section anti slide pile with rectangular reinforcement cage is better than the circular section anti slide pile with accurate positioning in seismic fortification area.