【作者】 刘浜葭；

【导师】 张向东；

【作者基本信息】 辽宁工程技术大学 ， 工程力学， 2009， 博士

【摘要】 风积土在我国分布范围较广,具有显著的结构性。特别是我国北方地区和西部高纬度地区,在温度、应力和渗流作用下,路基常伴随着冻胀、融沉、强度弱化等一系列现象,其根本原因在于路基填料结构性的损伤与演变,导致道路产生严重病害,给交通系统带来巨大经济损失。本论文的研究对象为我国东北地区的风积土,主要研究了风积土路基填料的基本物理力学性质、初始结构性及其在季节性冻胀、应力、含水量综合作用下的演变规律,并建立了相应的基于贯入值参数的数学模型。本文先后采用贯入值参数、冰率、冻胀比和融沉比三种不同参数研究了风积土填料路基的冻胀融沉特性及其结构性变化规律。经过试验和理论分析,得到了反映冻融对土体结构性影响的动态结构性参数。基于损伤理论,引进结构性参数作为其损伤比,建立了考虑冻融作用的土体结构性模型,由于结构性参数中包含了温度、水分、应力的相互作用对结构性的影响,因此该模型间接反映了温度场、渗流场和应力场的耦合作用。通过本论文的研究,更加深刻的揭示了复杂冻融条件下风积土路基的结构性变化规律及机理,对彻底解决北方风积土地区道路病害有重要科学价值和推广应用前景。更多还原

【Abstract】 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.更多还原