Research Of The Interaction Between Landslide And Pile-anchor Structure

Landslide is a kind of very serious nature of natural disasters,and with China's western development,the large-scale infrastructure have been constructed, in the project construction,more and more landslides have been found,which are more and more larger,the mechanism are more and more complex,and the governance difficulty is growing.At present the main measures about the regulation of landslide is anti-slide pile and anchor pile and etc. Although, these two governance structure has been widely used in projects, the design theories of computation is still not perfect, Such as the design of pile spacing is based on experience or project determined, not considered the pile-soil interaction; the research about the theoretical of pile design calculation of the structure as lagged far behind in engineering practice.This paper focuses on two issues:the interaction of between landslide and pile and pile anchor deformation coordination.The main achievements obtained are as follows(1)Through the analysis of mobile door experiment of Terzaghi,On the basis of improved mobile door test by Chevalier,and the anti-slide pile and landslide interaction process model by Li Changdong,the minimum Pile interval model and the maximum Pile interval model are Proposed based on the soil arching effeet behind the piles,and the soil arching effeet between the piles.And the model of pile spacing which have been calculationed in two different practical examples of landslide are analyzed.Analysis results show that the calculation of pile spacing in different parameters of landslide are faouring,Due to the existing theories of pile spacing is still in the theoretical calculation theory study phase, In order to make it better service for construction projects,Still need more scholars to further research and discussion, and accept the inspection by project(2)Soil arching effect between landslide and pile has been discussed by 2-d numerical simulation method, analysis of different pile spacing, different factors such as soil parameters on the soil arching effect.The results show that:in the case of constant sliding force,When the pile spacing is small or C,υvalues larger,Sliding force is mainly responsible by Pile back, this time ,Major role for the pile of soil behind arch;As the pile spacing increases or C,υvalue become smaller,fall back under the force of pile becomes smaller, until a fixed value,Pile sliding force is gradually increasing commitment, this moment,Pile soil behind arch has been destroyed, play a major role for the pile soil arching.(3)Summary of the five existing methods of calculating pile anchor, and pointed out the deficiencies of each method.then Taking into account the deformation of the pile anchor and co-ordination and cableangle, an improved calculation of prestressed anchor pile new methods. Meanwhile, though the actual project,By the analysis of a anchor piles'bending moment in there typical calculation of anchor pile,we can find out that,when the cable tension so that the pile is equal to ite positive and negative bending moments,Sustaining Optimal pile anchor friction force(4)With "panzhihua airport landslide" as an example,use of the above results,the original program about anchor piles can be optimized,after optimization of pile body, its stress is better than the original anchor pile.To get the reinforcement calculation of anchor-pile by the original design method and the method which is been given in this paper, Results show that,the amount of reinforcing steel which are calculated by the method that is established in this paper has reduced ,but not obvious.