层状粘弹性地基一维固结特性.pdfVIP

学兔兔 第34卷第3期 土 木 建 筑 与环 境 工程 Journal of Civil。Architectural Environmental Engineering Vo1．34 NO．3 2012年 6月 Jun．2O12 层状粘弹性地基一维固结特性 刘加才，马 强 (南京工业大学 交通学院，南京210009) 摘 要：采用Merchant流变模型模拟土体的粘弹性，针对层状黏弹性地基一维固结偏微分方程，利 用Galerkin加权残值方法推导了该问题有限元矩阵表达式。将求解方法编制成应用程序，通过单 层黏弹性地基和双层线弹性一维固结问题解答与解析解答对比，验证了求解方法和程序的有效性。 采用程序对三层黏弹地基一维固结问题进行了算例分析，研究了处于不同深度处土层在不同时刻 受土体粘滞性影响程度，以及粘弹性参数叩 对土体孔压消散的影响。分析结果表明，黏滞性土体 孔压消散慢于线弹性土体，且随着时间的增加和土层距离排水面距离的增加，这种现象更明显，在 土层固结度达到8O ～9O 时两者差异达到最大值。粘弹性参数刁 越大，粘滞性土体与线弹性土 体固结度差异越大，且对土体的固结度影响也越提前。 关键词：层状；有限元；黏滞性；一维固结 中图分类号：TU471．2 文献标志码：A 文章编号：1674—4764(2012)03—0034—05 One Dimensional Consolidation Analysis of Layered Clay Soils Exhibiting Rheological Characteristics LlU JiacQi，MA Oiang (College of Transportation Science＆ Engineering，NanjingUniversity of Technology，Nanjing 210009，P．R．China) Abstract：The rheological characteristics of clay soils were described by Merchant mode．The governing equation for consolidation of layered clay soils exhibiting rheological characteristics was solved using the finite element method．Matrix formulation was derived by Galerkin’S weighting residual method．The proposed FE procedure was encoded in a program．The presented formulation and program code were examined by using the analytical results of two simplified problems，a one—layer clay soil exhibiting rheological characteristics and a double—layer elastic clay soil．The comparison shows that the numerical resuIts agree well with those of analytic