Numerical Study On Mechanism Of Two Different Kinds Of Pile-anchor Supporting Structure

In recent years, the pile-anchor supporting structure is widely used in foundation pitsupporting engineering, and it cased the attention of many scholars at home and abroad, nowthey begin to study about it. In the practical engineering,there are two kinds of forms aboutthe pile-anchor supporting structure: pile-anchor combined support structure and pile-anchorseparate supporting structure, but in actual engineering design, this two kinds of design arehardly be considered, and in both the pile-anchor supporting structure displacement andinternal force of research are rarely found. Due to the difference between the two kinds ofpile-anchor supporting structure in terms of the role of anchor and anti-slide pile,it is certainto lead to two kinds of pile anchor supporting structure differences in the displacement andinternal force. Based on the above reasons, this paper studies about the difference between thetwo kinds of pile-anchor supporting structure on the displacement and internal force; andthen modifiers the formula of the pile-anchor supporting structure used in the currentspecification.This paper’s study results are as follows:1、 The anti-slide pile displacement of the two kinds of pile-anchor supporting structure isbetter, the whole pile displacement curve is acted as arc shape; the maximum of thenegative bending moment is at9m, ending moment zero appeared at11.2m, themaximum of positive bending moment was at15.5m.2、 The displacement and bending moment value about pile-anchor combined supportingstructure is less than about pile-anchor pile separate supporting structure, and thepile-anchor combined effectively reduce the displacement of pile top21.36%, reduce16.05%of the bending moment value,reduce13.10％of the shearing force.3、 Within a certain range, increasing the anti-slide pile diameter and pile’s built-in depth canreduce the anti-slide pile displacement and bending moment value of pile and anchorseparate supporting structure reduce degree is more obvious,while change the size of thecrown beam,the displacement of the separated pile-anchor supporting structure’ s pile willbe more influenced.4、There is a synergy between crown beam and anti-slide pile. Crown beam can connect theanti-slide pile as a whole, can coordinate the deformation of the pile. At the same timeincrease the size of the crown beam can reduce the deformation,5、Anchoring bolt in the pile-anchor supporting structure is very important, removing theanchor anti-slide pile displacement curve has changed, after bending down zero value too. After the bolt prestress can reduce the displacement and internal force, the bendingmoment is obviously reduced, the bending moment of pile-anchor combined supportstructure can reduce2.07times, the bending moment of pile-anchor separate supportingstructure can reduce1.74times.6、In separate cases pile anchor moment numerical method to calculate the average value of8.17%over a large specification method, numerical methods than the average sheardecency act large11.19%, so when using separate pile-anchor retaining structure, neednormative correction formula were multiplied by the correction parameters. m=1.08andv=1.12.