摘要
基于软黏土一维非线性大应变固结基本理论,建立了能考虑荷载变化、土层自重等因素影响的拉格朗日坐标下以超静孔压u为变量的一维大应变固结控制方程,并通过对土体压缩性和渗透性的假定获得了方程的解析解。基于此解,分析了单级等速加荷条件下软黏土一维大应变固结性状。从中可见,大应变固结过程中土体变形的发展要快于超静孔压的消散;荷载增大,超静孔压消散趋慢;加荷速率越大,土体固结越快;考虑土层自重影响时孔隙比的分布更为合理。此外,本文的解析解也可用于验证各种大应变固结数值解法的正确性。
Based on the general theory for 1D nonlinear large strain consolidation of soft soil, the governing equation in the form of excess pore water pressure was established in lagrangian coordinate, in which timedepending loading and selfweight of clay etc. can be taken into consideration. By making the assumptions on the soil compressibility and permeability, the corresponding analytical solution was obtained, through which the behavior of 1D large strain consolidation in one step loading was then investigated. It shows that the rate of settlement is greater than the rate of excess pore water pressure dissipation during large strain consolidation, the dissipation of excess pore water pressure will be slower with the increase of loading, and the selfweight of clay has great influence on the void ratio distribution. The proposed analytical solution is also can be used to verify other numerical solutions of large strain consolidation problem.
出处
《水利学报》
EI
CSCD
北大核心
2003年第10期6-13,共8页
Journal of Hydraulic Engineering
基金
国家自然科学基金资助项目(50079026)
关键词
饱和软黏土
变荷载
非线性
大应变
一维固结
解析理论
saturated soft clay
time-depending loading
nonlinear
large strain
1-D consolidation
analytical theory
