【作者】 于崇；

【导师】 张向东；

【作者基本信息】 辽宁工程技术大学 ， 岩土工程， 2007， 硕士

【摘要】 针对辽西风积土,通过含水率试验、密度试验、土粒比重试验、颗粒分析、界限含水率、固结试验、击实试验、三轴剪切试验的测定,系统地研究了风积土的物理力学性质,进而对土体的初始结构性进行评价。考虑影响土体冻胀融沉的温度、含水率、载荷、干密度,地下水埋深的五个主要因素,采用5因素9水平的均匀设计。根据试验结果分析了各因素对冻胀融沉的影响规律以及温度、水分场、冻胀力变化规律。利用均匀设计软件和参数优化软件,建立土体基于均匀设计的预报模型,并利用建立的模型对不同的温度、水分和干密度、地下水位条件下土体的冻胀量和融沉量进行预报。采用微观测控软件观测冻融对土体微观结构性影响,通过土体在冻结和融化阶段的强度与变形的特性反映冻融对土体结构性宏观上影响。经过试验和理论分析,建立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、水分场和应力场的耦合作用。更多还原

【Abstract】 The physical property and mechanics property of aeolian soil in the west of Liaoning province is studied systematically by percent moisture content test, density test, specific density test, mechanical analysis test, crucial water-content coefficient test, consolidation test, compaction test, triaxial compression test. The soil’s initial structural characteristic is also gained by comparing analysis in the middle of experiment.Considering the influence of temperature, percent moisture content, load, dry density, the ground water burying depth five primary factors, freeze-thaw experiment scheme adopts 5 factors 9 levels-Uniform Design. The various factors influence as well as the temperature field, the moisture field, the frost-heave force change rule are analyzed according to the test result. Using the software‘WUST’establishes the forecast model based on Uniform Design and uses the establishment model to forecast different temperature, load, percent moisture content, the dry density and the groundwater level condition the soil frozen-heave quantity and thaw-sedimentation quantity.The observation of freezing and thawing influence to the soil microscopic structural characteristic is gained through the microscopic observation and control software. The strength and distortion characteristic reflect macroscopic influence to the structural property.After experiment and theoretical analysis, I establish the reflection freezing and thawing to the soil structural characteristic influence dynamic structural parameter. Based on the damage theory, considered the freezing and thawing function, taken the structural parameter as damage radio, I establish soil structural model. Because the structural parameter has contained the temperature field, the moisture field, the stress field mutual function to the structural influence, therefore this model has reflected the temperature field, the temperature field, the moisture field, and the stress field coupling function indirectly.更多还原