Researching Distribution Of Earth Pressure On Retaining-pile Structure For Deep Excavation

The practices of geotechnical engineer is more than its theories, especially to the condition of deep excavation ,its retaining structure design have to depend on both theoretical calculations and engineering experience in modern stage. For cantilever pile retaining structures, we usually applied classical earth pressure theories to design, but this designing method neglects the influence of the interaction between soil and retaining piles.This paper based on the engineering practice, through compiling program of APDL parameters, it established a 3-D FEM model of piles-braced cuts and conducted comparative analysis between the results of calculation and measuring datas. The results of calculation is consistent with the measured results,so it resolved the model establishment problem considering interaction between soil and retaining piles ,analyzed the characteristics of earth pressure and studied the soil-pillar problems:(1) through changing the width of soil-pillar, this paper proceeded sensitivity analysis to c ,(?) value of soil mass and modulus of deformation, achieved the trends of deformation on the top of retaining piles, defined the influence scope of the soil pillar problem according to calculations and the actual situation, confirmed that the width of soil pillar obviously influence the earth pressure.(2) by the procedure of ANSYS, this paper achieved the characteristics of earth pressure,compared both of the classical Coulomb's and Rankine's earth pressure. because of the different research objects, earth pressure that this text calculated is significant different from the two kinds of classical result in the form of distribution or value;(3) in addition, based on the soil arch-principle, this paper achieved the calculation formula of active earth pressure above the boottm at pit.