摘要
目前在防波堤设计和施工中,较少考虑软粘土的蠕变特性对软土地基长期变形的影响。为准确预测斜坡堤软土地基的变形水平,研究采用Plaxis二维有限元程序,利用不考虑蠕变的摩尔-库仑模型和能反映土体时间效应的软土蠕变模型,模拟某斜坡堤地基软土层施工期和工后的地基变形过程,对比分析了两种不同模型的计算结果,表明由软土蠕变模型得到的软土层的变形量、超静孔压随时间的变化规律均较为合理,而摩尔-库仑模型的结果则会低估变形水平,说明了在类似工程设计和施工中考虑蠕变特性的必要性和合理性。
In breakwater designs and engineerings nowadays, less consideration is given to the long term deformation of a soft soil foundation. In order to accurately predict the deformation of soft soil foundation under a sloping breakwater, the Plaxis 2D FEM pro- grams are used for this study. The Mohr Coulomb model, where the creep behavious of the soft soil foundation is not taken into consideration, and the numerical model in which soft soil creep can be reflected to discuss its long term effects, are respectively employed to simulate the deformation process of the soft soil foundation under a sloping breakwater respectively in the engineering period and in the post-engineering period. It is learnt from the comparison between the two models that the deformation degree and the time variation of the excess pore pressure estimated by the creep-involved model are more reasonable, while the underestimated deformation results from the Mohr-Conlomb model. Therefore it is necessary and reasonable to take the creep behavious into consid- eration for the designs and engineerings similar to this case.
出处
《海岸工程》
2011年第1期1-8,共8页
Coastal Engineering
关键词
蠕变
斜坡堤
软土地基
变形
数值分析
creep
sloping breakwater
soft soil foundation
deformation
numerical a nalysis
