Study On The Constitutive Change Laws Of The Aeolian Soil Roadbed Under The Coupling Function Of Freezing,Thawing And The Transfusion

The aeolian soil is broad in our country distribution range which has the remarkable structural characteristic. Especially in northern area and the western high latitude area of our country, under the function of the temperature, the stress, the moisture content and the transfusion, the roadbed often follows a series of phenomena including the heave, sink, the intensity attenuation and so on, its basic reason lies in the roadbed padding structural characteristic damage and the evolution, causes the road to have the serious plant disease, brings the huge economic loss for the transportation system.This thesis's object of the study is our country Northeast area's aeolian soil, and has mainly studied under the aeolian soil roadbed padding basic physical mechanics nature, initial structural characteristic and evolution rule in the seasonal heave, the stress, the water content combined action, and has established correspondingly based on the penetration value parameter mathematical model. The thesis used the penetration value parameter, the ice rate successively, the heave ratio and sinks compared to three kind of different parameters studies the aeolian soil padding roadbed heave to sink friendly the characteristic and the constitutive change rule. After the experiment and the theoretical analysis, have established the reflection freezing and thawing to the soil body constitutive property influence dynamic constitutive parameter. Based on the defect theory, the introduction constitutive parameter as its damage ratio,which has established the consideration freeze-thaw action soil body constitutive model, because of the constitutive parameter has contained the temperature, the moisture content, the stress interaction to the constitutive influence, therefore this model has reflected the temperature field, the water sub-field and the stress field coupling function indirectly.Through this thesis's research, the more profound revelation complex freezing and thawing condition leeward fill roadbed's constitutive change rule and the mechanism.It also has a important scientific value and the promoted application prospect to the north area of aeolian soil road damagement.