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Expermential Study on Dynamic Characteristics of Aelian Soil in West Liaoning Province

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Tutor: ZhangXiangDong
School: Liaoning Technical University
Course: Geotechnical Engineering
Keywords: aelian soil in west Liaoning province,dynamic strength,liquefaction,dynamic elas
CLC: TU411
Type: Master's thesis
Year:  2011
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Abstract:
The aelian soil in west Liaoning Province is a kind of silty clay with minuteness and very fine particle and it¡¯s mechanical property is also bad. Because of it¡¯s bad physical and mechanical properties, it¡¯s dynamic behavior is also not very good under the action of vibrating load. In order to research the dynamic behavior of aelian soil in west Liaoning province comprehensively, the work of this paper is described as following:Through a series of dynamic triaxial test, the dynamic strength of saturated original aelian soil is studied. The test results show that the failure dynamic strength of aelian soil increases with ambient pressure and consolidation ratio, and the dynamic shearing strength of aelian soil is closely related to consolidation. Through contrasting with static and dynamic triaxial test, it shows that dynamic cohesion is less than static cohesion.In different consolidation, the liquefaction behavior of satured original aelian soil is studied. The results show that liquefaction shearing stress ratio is increasing with consolidation ratio and decreasing with ambient pressure. Meanwhile, the method of liquefaction estimating using dynamic triaxial test and the model of liquefaction estimating based on SVM are introduced.Through the dynamic elastic modulus test and damping ratio test of aelian soil in different consolidation, the relation curve of the dynamic elastic modulus and the cyclic vibration numble and the relation curve of the damping ratio and the cyclic vibration numble are obtained. Using the relation curves above, maximum dynamic elastic modulus and maximun damping ratio are got. Through the numerical analysis, the relationship equations of maximum dynamic elastic modulus and maximun damping ratio with effective consolidation pressure are obtained. The results show that the maximum dynamic elastic modulus is in proportion to the power function of effective consolidation pressure, and the maximun damping ratio is in inverse proportion to effective consolidation pressureTwo kinds of high-speed railway roadbed with traditional AB material and with lime-flyash-improved soil are imitated with ADINA. Contrasting with the relationship of the maxium vertical displacement of two roadbeds, the imitation results show that the roadbed with AB material is better and the resisting dynamic settlement is better than the roadbed with lime-flyash-improved soil, but the dynamic settlement of the latter is also small.
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