非饱和土体渗流—变形分析研究
发布时间：2018-09-01 05:31
【摘要】：非饱和土体的渗流问题,土石坝、堤防、基坑等的渗流控制、渗流场和应力场的互相影响及其耦合计算,一直是土力学及岩土工程界中非常重要的问题,我国非饱和土体的研究起步晚,缺少一套能用于实践的完整理论。在土体的渗流及应力应变分析中,没有正确考虑非饱和土的渗流是不可能模拟的,分析中如果忽略非饱和土体基质吸力对整个土体的影响,最终得出的土体变形及稳定与实际情况会存在一定差别。并且目前许多土石坝、堤防等工程在安全分析中,较少考虑非饱和土的渗流作用影响以及渗流场、应力场的耦合影响。 本文在总结前人研究成果的基础上,阐述了非饱和土体渗流理论,非饱和土的土水特性曲线、渗透系数函数,非饱和土渗流场、应力场耦合计算的有限元方程,研究和探讨了饱和-非饱和稳态及瞬态的渗流计算有限元分析,堤防填筑软土地基的耦合固结,粘土心墙坝分层填筑竣工期的应力变形分析、蓄水期考虑渗流场和应力场耦合影响的应力变形计算分析。
[Abstract]:The seepage problem of unsaturated soil, seepage control of earth-rock dam, dike and foundation pit, the interaction between seepage field and stress field and their coupling calculation are always very important problems in soil mechanics and geotechnical engineering. The study of unsaturated soil in China started late and lacked a complete theory that can be used in practice. In the analysis of soil seepage and stress and strain, it is impossible to simulate if the seepage of unsaturated soil is not considered correctly, if the influence of matrix suction of unsaturated soil on the whole soil mass is ignored in the analysis, Finally, the deformation and stability of soil will be different from the actual situation. At present, in the safety analysis of many earth-rockfill dams and dikes, the influence of unsaturated soil seepage and the coupling of seepage field and stress field are seldom considered. On the basis of summarizing the previous research results, this paper expounds the seepage theory of unsaturated soil, the soil water characteristic curve of unsaturated soil, the function of permeability coefficient, the seepage field of unsaturated soil and the finite element equation of stress field coupling calculation. The finite element analysis of saturated-unsaturated steady state and transient seepage calculation, the coupling consolidation of embankment and soft soil foundation, and the stress and deformation analysis of clay core dam during the completion period of layered filling are studied and discussed. Calculation and analysis of stress and deformation considering the coupling effect of seepage field and stress field in water storage period.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU43
本文编号：2216243
[Abstract]:The seepage problem of unsaturated soil, seepage control of earth-rock dam, dike and foundation pit, the interaction between seepage field and stress field and their coupling calculation are always very important problems in soil mechanics and geotechnical engineering. The study of unsaturated soil in China started late and lacked a complete theory that can be used in practice. In the analysis of soil seepage and stress and strain, it is impossible to simulate if the seepage of unsaturated soil is not considered correctly, if the influence of matrix suction of unsaturated soil on the whole soil mass is ignored in the analysis, Finally, the deformation and stability of soil will be different from the actual situation. At present, in the safety analysis of many earth-rockfill dams and dikes, the influence of unsaturated soil seepage and the coupling of seepage field and stress field are seldom considered. On the basis of summarizing the previous research results, this paper expounds the seepage theory of unsaturated soil, the soil water characteristic curve of unsaturated soil, the function of permeability coefficient, the seepage field of unsaturated soil and the finite element equation of stress field coupling calculation. The finite element analysis of saturated-unsaturated steady state and transient seepage calculation, the coupling consolidation of embankment and soft soil foundation, and the stress and deformation analysis of clay core dam during the completion period of layered filling are studied and discussed. Calculation and analysis of stress and deformation considering the coupling effect of seepage field and stress field in water storage period.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU43
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