The Influence Of The Water Content On Both The Shear Strength Of Unsaturated Soil And A Single Pile's Bearing Capacity

Unsaturated soil is widely dispersed all over the world.The soil on the earth'surface having a intimate relation with engineering practice is almost unsaturated soil,specially in dry and half dry area.Because evaporative spiration is bigger than rainfall,and the groundwater level is high, in strict sense,the surface soil of this area isunsaturated, While earth dam, railway, highway bed filled of soil and some dense soilare all in unsaturated state.So unsaturated soil is really often encountered soil in theengineering practice, saturated soil is unsaturated soil' special case. But for a varietyof reasons, now a lot of unsaturated' soil' theory borrows saturated soil' theory, thiscan not avoid errors to engineering application. So research unsaturated soil'sconstitutive relation has important sense. It is significantly meaningful to researchconstitutive relation of unsaturated soil.The text reviewed some research results of predecessor at first,summarizing thedevelopment present condition of unsaturated soil basic strength theories at home andabroad. Miaolinchang and others put forward a similar formula of Mohor-Coulomb'sstrength theory,which applied to analyse the physical parameter of clay in Nanchangand then got a disciplinarian between water content and shear strength.By a methodof fitting curve,the auther gained a similar formula. Miaolinchang with someothersfurther to put forward on the foundation for experimenting on this foundation ofinflation unsaturated soil strength of exponential function formula.By laboratory soiltest,the textgot the experiment parameter of Nanchang.Meantime, parameters are obtained in experiment. ANSYS software is used toanalyze its influence to a single pile's bearing capacity, For more agreeing with tomatch physically with engineering, this literary sets up a mold with the 3D entity, itssizes are physically similar to engineering.The interrelation between pile and soil useosculating element to simulate and make use of Drucker-Prager elastoplastic model toreflect the constitutive relation of soil. Passes to select calculation parameter and triesto make its calculation convergen. The results found in finite element model are ingood agreement with those obtained in the theory, by optimizing parameters andmaking its calculation convergent.