变荷载下考虑结构性的双层地基一维非线性固结分析  

One-dimensional nonlinear consolidation analysis of double layered structured soils under time-dependent loading

作　　者：崔军[1,2] 谢康和 夏长青[1,2] 胡安峰 周禹杉[1,2] CUI Jun;XIE Kanghe;XIA Changqing;HU Anfeng;ZHOU Yushan(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [2]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058

出　　处：《中南大学学报（自然科学版）》2018年第7期1710-1717,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51778572;51278453);国家教育部博士点基金资助项目(20120101110029)~~

摘　　要：考虑变荷载下结构性软土双层地基在固结过程中压缩性和渗透性的非线性变化,基于e-lgσ′两折线压缩模型及e-lgkv渗透关系,利用半解析方法和成层地基一维固结解析解对结构性软土双层地基一维非线性固结问题进行求解。编制相应的计算程序,通过实例计算,分析变荷载下考虑结构性的双层地基一维非线性固结性状,分别讨论土体结构性、加载速率、结构屈服应力和渗透指数对地基固结性状的影响。研究结果表明:考虑土体结构性影响比未考虑土体结构性的固结速率增大,最终沉降量减小;当最终荷载不变时,随着加载历时的增大,地基固结过程变慢;结构性软土结构屈服应力增大,超静孔压消散加快,土体固结速率增大;双层地基各层渗透指数对超静孔压影响较为复杂,对上下层地基沉降速率影响不同。Based upon the nonlinear variation of compressibility and permeability in the process of consolidation,and based on e-lgσ′two-stage compression model and e-lg kv relationships,one-dimensional nonlinear consolidation problem of double layered structured soft soils was solved by using semi-analytical method and analytical solutions for one-dimensional nonlinear consolidation.A corresponding computer program was developed,and then consolidation behavior is discussed by practical calculation examples.The results show that the rate of consolidation with considering soil structure effect becomes faster than that without considering soil structure effect.If the ultimate load remains unchanged,the greater the loading time,the more slowly the total process of consolidation.The greater the yield stress of structured soft soil,the smaller the excess pore water pressure,and the faster the development of soil consolidation.In the process of consolidation,the influence of permeability index for double layered foundation is more complicated,and is different for the consolidation rate in the upper and the lower layers.

关 键 词：结构性软土 双层地基 非线性固结 半解析方法 固结性状 

分 类 号：TU43[建筑科学—岩土工程]