层状粘弹性地基一维固结特性
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One Dimensional Consolidation Analysis of Layered Clay Soils Exhibiting Rheological Characteristics
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    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η 1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80%~90%时两者差异达到最大值。粘弹性参数η 1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。

    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 results agree well with those of analytical results. A three layer clay soil exhibiting rheological characteristics was used to analyze influence of rheological characteristics and its parameter η 1 on different layers at different time. The results show that consolidation of clay exhibiting rheological characteristics is slower than that of clay exhibiting elastic characteristics. The phenomenon becomes more obvious over time and the distance between the clay and the pervious plane increases. Difference between the pore pressure dissipation of rheological clay and that of elastic clay reaches its climax when the consolidation degree of clay is in the range from 80% to 90%. Difference between the consolidation degree of rheological clay and that of elastic clay becomes larger and the influence time is earlier with higher creep parameter η 1.

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刘加才,马强.层状粘弹性地基一维固结特性[J].土木与环境工程学报(中英文),2012,34(3):34-38. LIU Jiacai, MA Qiang. One Dimensional Consolidation Analysis of Layered Clay Soils Exhibiting Rheological Characteristics[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2012,34(3):34-38.10.11835/j. issn.1674-4764.2012.03.007

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