The Structural Mechanics Research On Oblique-inserting Slab-pile Wall Of Hanging Slab Based On Soil Arching Effect

The oblique-inserting slab-pile wall is a new type of slab-pile wall structure form,which can not only as a traditional slab-pile wall retaining structures to maintain the stability of the slope soil,Through plant planting,itself will also be able to play the role of greening.Usually,there are two ways to connect the oblique-inserting slab,Such as hanging slab and anchoring slab.At present,the research and application of engineering practice is still relatively less about The oblique-inserting slab-pile wall.Based on the special structure of the new retaining wall and its own greening advantage,It is very necessary to research on the mechnaics of structure and other aspects of the oblique-inserting slab-pile wall in order to further promote the application of this new kind of retaining wall structure.This paper mainly studies the distribution of earth pressure;soil arching effect;determination of reasonable pile spacing;structural stress and other aspects of the Oblique-inserting Slab-pile Wall with Hanging slab base on soil arching effect.Through a large number of relevant literatures of domestic and foreign research and analysis,according to the similar theory of model test and the characteristics of oblique-inserting slab-pile wall structure to select the appropriate model test material and process model device.then carry out the model test according to the model test plan.In addition,based on the basis of model test to build the numerical analysis model by using finite element analysis software.Finally,through comprehensive comparative analysis the results of numerical analysis and model test to obtain the influences of different pile spacing on the distribution of earth pressure;soil arching effect;determination of reasonable pile spacing and structural stress of the Oblique-inserting Slab-pile Wall with Hanging slab base on soil arching effect.According to the theory of soil arching effect in the second chapter,by the results of numerical calculation and model test results,it can be concluded that:1)The earth pressure behind the model pile is greater than the theoretical value of the active earth pressure,Which value is slowly increasing with the increase of the cantilever section of the pile,and then quickly decreases.2)The earth pressure back the oblique-inserting slab is less than the theoretical value of the active earth pressure,Which value is generally serrated change,with the increase of the cantilever section it also present slowly increasing at first and then decreases.3)The soil arch strength is first increase and then decrease with the increase of the cantilever section and showing a weakening trend on the whole with the increase of pile spacing.4)With the increase of the cantilever section,the structure stress of pile increases rapidly and the stress of the slab increases first and then decreases;With the increase of pile spacing,the increase speed of slab structure is much larger than that of pile.5)According to the research results of this paper and the principle of Unloading arch,Deduced the the calculation formula of earth pressure behind the model pile and oblique-inserting slab base on Soil arching effect;6)According to the variation of soil arch strength with pile spacing,taking into the economic and the structure stress causes,in order to make full use of soil arching effect,we suggest that the reasonable spacing between piles should be taken from 3 to 4 times the width of the pile section.