饱和土体一维复杂非线性固结特性研究  

Study of properties of 1-D complex nonlinear consolidation of saturated soils

作　　者：吴健[1,2] 谢新宇[3] 朱向荣[1,4] 

机构地区：[1]浙江大学软弱土与环境土工教育部重点实验室,杭州310027 [2]中国汉嘉设计集团股份有限公司,杭州310005 [3]浙江理工大学建筑工程学院,杭州310018 [4]浙江大学宁波理工学院,浙江315100

出　　处：《岩土力学》2010年第1期81-86,共6页Rock and Soil Mechanics

基　　金：浙江省自然科学基金资助项目(No.Y1090971);浙江理工大学科研启动基金(No.0814835-Y)

摘　　要：结合大量宁波软土室内固结与压缩试验数据,采用偏微分有限元软件FLEXPDE,同时考虑土体固结过程中材料和几何的复杂非线性,进行了土体固结特性研究。在压缩指数和渗透指数不同比值条件下,进行了解析解推导和有限元数值分析,得出了不同条件下土体有效应力和孔隙比沿高度的变化规律。结果表明,压缩指数和渗透指数比值不等于1时,由于数值解法充分考虑土体的复杂非线性,其结果与实际更加符合;而在比值等于1时所得出的结果与Gibson得出的结果一致;考虑土体材料和几何复杂非线性使得有效应力及固结度预测偏于安全。Combining large number of indoor consolidation and odeometer test data of Ningbo soft soil, using partial differential finite element software FLEXPDE, and taking into account complicated geometry and material nonlinearity of soil, the characteristic of soil consolidation is investigated. Under the conditions of different ratios of compression index to permeability index, analytical solutions and numerical solution as well as the distribution of effective stress and void ratio with height are obtained. The results showed that numerical solution fully taken into account the complex nonlinearity of soils; and results more in line with actual conditions when the ratio of compression index to permeability index is not equal to 1; the results are consistent with the results of Gibson＇s in 1981 when ratio is l; it＇s more safe to forecast the effective stress and the consolidation degree when considering the complex nonlinearity of geometry and materials of soil.

关 键 词：解析解 数值解 大变形 一维固结 复杂非线性 

分 类 号：TU443[建筑科学—岩土工程]