| At present,the inclined pile has been applied in many engineering projects.Such as the foundation of the structure in roads and bridges,port and pier,power line towers and offshore drilling platforms.However,inclined piles are rarely used in foundation pit supporting works.Most Chinese foundation pit supporting projects,straight pile supporting form has been widely used in row piles supporting structure.By analyzing the application of inclined piles in existing projects,we found that inclined piles can fully exert their axial compressive capacity and reduce the pile shear force and bending moment caused by horizontal loads such as wind load,seismic load,flowing water and wave load.Based on this background,we will apply the inclined pile to the actual excavation supporting engineering.With field test and finite element numerical simulation analysis,this paper emphatically studies the mechanism of slope supporting piles in foundation pit.Based on the formula of coulomb theory and existing traditional vertical pile internal force analysis theory,we deducted the calculation method of internal force of single row inclined pile in a particular inclination angle.In this paper,the application of inclined support pile in foundation pit is briefly introduced and explained,and the test results are compared and analyzed.And it is found that the greater the inclination angle of inclined support pile is,the smaller the horizontal displacement of pile top is,and the horizontal displacement of inclined support pile and alternate support pile with the same angle is smaller than that of the single inclined pile.In addition,in order to study the mechanism of inclined support pile in foundation pit support,three-dimensional modeling analysis is carried out by using the threedimensional finite element analysis software PLAXIS 3D,which designed fors the deformation and stability of geotechnical engineering.Through the test results of field engineering examples of inclined support pile,the feasibility and parameter selection of the ideas and methods of finite element simulation are verified.The main purpose of this paper is to analyse the rule of horizontal displacement of pile top,lateral displacement of pile body,the bending moment of pile body,displacement of soil body and earth pressure of pile under different inclination angles and different distribution methods,while the inclined angle lies between 0°~20°.What's more,the effect of supporting pile inclination angle and pile distribution method on the overall stability of foundation pit is analyzed by strength reduction method.Finally,with the help of Coulomb theory formula and the existing theory of vertical force analysis of vertical piles,this paper will deduce the calculation method of internal forces of single-row inclined piles within a certain inclination angle. |
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