The Research On The Mechanism Of The Pre-Stressed Anchor Pile

Landslide is a kind of geological disaster that always occurs and makes great hazard, and there is high incidence of such disaster in China, so researches on the prevention and treatment of landslide are of great practical significance.At present, the study on the countermeasure of landslide has owned great achievements, and anti-slide pile has been widely used. Pre-stressed anchor is a new anti-slide pile retaining structure, and relative to the general one, it owns more rational mechanical state; In particular, when used in conjunction with the retaining plate, under the formation of anchor pile wall, it makes the governance of broken rock landslide much more effective, so it has wide range of application after yield. But generally speaking, the method of the calculation for the anchor pile design is the combination of elastic foundation coefficient and single parameter.The limitation of sigle-parameter method leads to the result that the structural design of piles can not match with the actual working environment very well; Besides, the theoretical study lacks correspongding guide,so there still exists some problems to be solved urgently.Taking the slope of a road in Xiling Snow Mountain as an example, this paper starts with the physical model of anchor pile, establishes relevant mechanical and mathematical models, introduces finite difference method, combines two-parameter method to get the analytical solution of pile's displacement, and finally acquires the pile's internal force, this makes a good foundation for the structural design of pile and provides certain reference value for the engineering applications of anchor piles as; well.Firstly, with reference to previous studies, this article makes brief discussion on some relevant thoeies about the anti-slide pile's control over landslide,including the research on the present situation of anti-slide pile,the calculation of the landslide's thrust and the mechanism of its distribution,the interaction between the piles and soil,the deternimation of the pile spacing and the cable pull, etc.Secondly, by the finite difference method and two-parameter method,this study derives the calculation on the inter force and displacement of the anchor piles.And then,it compiles visual programs that are easy to be realized under the use of the software-MATLAB,and shows the feasibility of the programs by some verifications furtherly.Based on these analysis,it reveals the sensitivity of two parameters to the inter force and displacement of anchor piles in the foundation coefficient method,and further indicates that the foundation coefficient should be selected carefully when calculating and analysing the anchor piles by two-parameter method,and when the condition alows,it is good to do on-site loding test or the count of dynamic penetration blow to determine the foundation coefficient of the rock and soil,which can make the calculated results of the displacement of pile top and the inter force and the role of location of piles match very well with their measured values.Finally,integrated with pratical projects and by the calculating programs compiled under MATLAB,this article puts the methods and design thories introduced above into practice perfectly.