Optimization Of Anti-slide Piles In High And Steep Slopes

In many failure modes of anti-slide pile,"overtopping" was a kind of failure mode with greater threat and bigger destructiveness.The overtopping failure of slope would threaten the safety of people and their property,and would form a large number of accumulation body,which would lead to a sharp increase in the cost of cleaning it,ven twice design is needed.Therefore,there was academic significance and engineering significance to study the model of the overtopping failure of the anti-slide pile and propose the optimization measures.Through the research on the design process of anti-slide pile and the process of overtopping,the determination method of the position,section width,pile spacing,embedded depth and bottom condition of the pile is analyzed,and the main influencing factors of process of overtopping of anti-slide pile are found.Secondly,based on the upper bound theorem,the mechanical mechanism of the anti-tide pile in the process of overtopping failure is studied.The purpose is to find the mechanical crnterion of the overtopping failure of the anti-slide pile.The results showed that the mechanical cause of the overtopping failure of the landslide is the new stress distribution in the slope,and there was a new secondary sliding surface after setting the anti-slide piles.The stability of the secondary sliding surface depends on the ratio of energy dissipation to external force work of the fracture surface and the intersections.Using SLIDE software to build a homogeneous slope model,and analysising the influence factors of the overtopping failure of high slope to prove that the overtopping failure of anti?slide pile is mainly affected by the pile position,arm length and slope anchorage conditions,which must be considered in the optimization process,and less affected by the influence of anchoring depth of anti-slide pile,therefore in the optimization process may be appropriate to consider.Taking the "Chenglong No.1”landslide as an example,the three-dirmensional geological model was established by FLAC3D,and the stability of the slope before and after setting anti?slide piles was simulated.By comparing with the field monitoring results,it is proved that the secondary slide surface produced at the top of the pile after the setting the anti-slide piles,and the overtopping failure occurs.The typical section 1-1 'of the landslide is taken as the research object,and FLAC3D is used to simulate the position of the pile,the length of the cantilever section and the anchorage condition of the slide pile.Get the following conclusion:?The farther the position of the anti-slide pile is,the more slow the slope is,the more it is not easy to destroy the top of the pile;?The relationship between the length of cantilever piles and the stability of anti-slide piles is a downward parabola.When the length of cantilever increases to a certain extent,it will be unfavorable to the overall stability of high slopes;?The stability of the slope can be effectively enhanced by applying the bolt(cable)on the surface of the upper rock and soil body of the anti-slide pile.But it is necessary to note that the bolt(cable)must pass through the secondary sliding surface,and its length and prestress should be suitable for the stability of high slope.The research contents can be used as the design basis for the optimal design of anti-slide piles,and can effectively save the engineering budget.Besides,it can provide a reference for the study of the overtopping failure problem,and bring significant economic and social benefits.