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Dynamic Behavior and Application of Improved Lime-Soil of Subgrade after Dry-wet Cycles

Author: TangJianZuo
Tutor: WangJianHua
School: Tianjin University
Course: Geotechnical Engineering
Keywords: Heavy haul railway embankment Filler soil Lime improved soil The fatigue strength of soil Dynamic deformation of lime improved soil
CLC: U214.11
Type: Master's thesis
Year: 2007
Downloads: 205
Quote: 1
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Abstract


Today's society , with the rapid development of high-speed , heavy-duty railway , for its roadbed filler improved soil requirements also increasingly high . Excellent kinetic performance the subgrade improvement fillers soil needs to be maintained in the long-term effects of the train load . Dynamic characteristics discussed in previous studies the impact of changes in environmental conditions for cement improved filler soil dynamic characteristics , so explore other types of improved soil ( lime improved soil ) , quantitative clarify wet and dry cycle lime improved soil dynamic the degree of influence of the characteristics and comparative analysis , it is very important . To solve these problems , this paper carried out the following aspects of the work . First, the relationship between the wet and dry cycle with lime improved soil fatigue strength . The application of dynamic triaxial test determination lime soil fatigue strength under different wet and dry cycles , and then analyzes the impact of dry and wet cycles on the fatigue strength decreased . Then , based on the application of the actual situation of the improved soil roadbed to study the impact of the wet and dry cycle lime improved soil dynamic deformation . Lime improved soil vibration elastic modulus E_d of damping ratio λ, the vibration plastic strain ε_p of three starting quantitative description of the dynamic stress-strain relationship , and analysis of the many wet and dry cycle for the impact of the dynamic stress strain relations . Finally, the combination of the actual design of the high-speed railway construction requirements and test results of this article , to analyze the role of stress on the subgrade , experienced many dry and wet cycle subgrade strength of improved soil designcheck and hierarchical sum the method used in the calculation of the dynamic deformation of high - speed railway roadbed base the bed improved soil filler layer train loads dynamic deformation settlement amount estimated by an example .

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CLC: > Transportation > Rail transport > Railway Line Project > Line of engineering materials > Non-metallic materials > Sand, stone , soil , slag material
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