Research On The Soil Consolidation Characteristic Around The Pill During Driving Process

When the Building ground subgrade soil which do not meet the ground bearingcapacity and deformation , yet not demand the subgrade treatment .Then ,use deeplevel foundation firm stratum or rock formation to subgrade supporting course. Adoptdeep foundation version, deep foundation include pile foundation, well foundation,pier cap and continuous concrete wall, the use of most frequent is pile foundation.While crowded soil pile by press in solum (eg, if stiffinesstenacious clay,loosening unconsolidated silt , silty clay), around dowel will yielding crowdedterritories effect, around dowel solum will yielding more stress and displacement,because the dowel clamp-on, close pile body department the solum soils the extrusionforce maximal, instant formation polar altitude pore water pressure, at the meantimesoil skeleton soils drastic squeezing, so that solum yielding many horizontal directionor vertical split, solum constitution wholly breakdown. With time increase,solumoccurrence consolidation,excess hydrostatic pressure gradual slaking,the shearstrength of solum gradual recovery, because have split, the consolidation speed ofsolum faster than the consolidation speed of flawless solum, So , find dosingevaluation driving pile making around solum consolidation is a demanded solution thesubject matter。Also a reality important subject.This article primo on the base of the lane strain state circular aperture expansiontheory, establishment space equilibrium differential equations set,then define thestress boundary condition, in plastic zone ,adopt Mohr-Coulomb yield criterion , tosolution equations set, deduce hole expansion provoke around soil stress distribution.union the consequence of circular aperture expansion theory and Henkel pore waterpressure calculation equation. Then,can deduce the calculation method of porewater pressure distribution . According to hydraulic power crack theory, while soilunit element water pressure (hydrostatic-pressure and excess hydrostatic pressure)surpass around restrain pressure force, soil occurrence split. According to circularaperture expansion theory and hydraulic power crack theory, obtain the conditions ofappear split. Because the existence of split in the soil. The speed of the consolidationof the soil far and away greater than consolidation speed of the no crack soil. For obtain the consolidation effectiveness of the pill of the cycle soil after pilling the.Establish uni-dimensional consolidation fundamental stable solution, on the base ofthe uni-dimensional consolidation theory. Establishment axisymmetric consolidationfundamental stable solution and derive the analytic. Obtain axisymmetricconsolidation Terzaghi-Barron solution according to engineering record andtheoretical formula, analysis the consolidation effectiveness, then obtain reasonableoutcome.