Study On The Theory And Anti Sliding Effect Of The Circular Anti Slide Pile Soil Arch With Anchor Cable Cluster

Anti-slide piles,as a common supporting structure for treating tall and large slopes,have been widely used in engineering practice.However,at present,most anti-slide piles are rectangular piles with large cross-sections.Such cross-section piles require manual digging to form piles.The construction efficiency is low and there is a high risk.However,circular piles can be used to form holes with a rotary excavator.The construction efficiency is high.At the same time,the safety of construction personnel is guaranteed.But for a single pile of uniform cross-section,the anti-sliding ability of a circular cross-section pile is not as good as that of a rectangular cross-section pile.Therefore,in the face of this situation,this article proposes a new type of anti-slide structure that uses multiple circular piles to be clustered together through the pier,that is,the anchor cable cluster type circular anti-slide pile.Aiming at this new type of pile,this paper uses theoretical analysis on the one hand to study its reasonable pile spacing based on the soil arching effect,and on the other hand,uses FLAC^3Dto analyze the influencing factors of this new type of pile.Finally,the theoretical derivation and numerical simulation are applied to engineering examples to analyze and evaluate the effect of slope stability.The main research contents and results are as follows:（1）Using the method of theoretical discussion,the structural form of the anchor cable clustered circular anti-slide pile is described,and its reinforcement mechanism is analyzed according to the characteristics of the rigid connection between the pile top and the cap pier.Finally,the anchor cable and the cluster are analyzed.Synergistic mechanism of anti-sliding piles against landslide thrust.（2）Based on previous experimental studies on the soil arching effect of circular anti-slide piles,this paper believes that the development process of soil arching effect of circular piles is:end-bearing soil arching-failure-friction soil arching-failure,and due to its The angularity is poor,and the end bearing soil arch is easily damaged.Therefore,the formula of reasonable pile spacing based on friction soil arching is deduced for circular piles,and the influencing factors are analyzed.Finally,an engineering example proves the rationality of the formula derivation.（3）Discuss the advantages and disadvantages of using solid elements and Pile elements to simulate anti-slide piles in FLAC^3D,model and analyze them separately,and compare the slope displacement,shear strain increment,and slope stability and safety in the numerical calculation results of the two coefficient.The results show that there is little difference between the two simulation methods.Because the Pile unit has the advantages of simple modeling and can directly monitor the internal force of the pile,the Pile unit is used to simulate the anti-slide pile in the follow-up research.（4）The anchoring depth,pile diameter,inner row distance of the cluster piles,the inner row distance of the cluster piles,and the anchor cable arrangement method of the anchor cable clustered circular anti-slide piles are changed by the numerical calculation method of the built-in strength reduction in FLAC^3D.Parameter research,analysis of the law of the pile displacement,internal force and slope stability safety factor with different parameters.（5）Combining engineering practice,using the reasonable pile spacing formula proposed in this paper and the anchor cable cluster type circular anti-slide pile structure,the slopes of related examples are reinforced,and compared with the original plan of rectangular section single pile reinforcement,after analysis It is verified that the slope reinforcement effect is good,and the safety factor of slope stability has been further improved compared with the original plan.