The development and evaluation of a constitutive model for the prediction of ground movements in overconsolidated clay
The development and evaluation of a constitutive model for the prediction of ground movements in overconsolidated clay
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DOI：
10.1680/geot.1997.47.2.235
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发表时间：
1997-04
期刊：
影响因子：
5.8
通讯作者：
S. Stallebrass;R. Taylor
中科院分区：
文献类型：
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作者：
S. Stallebrass;R. Taylor
超固结粘土的应力-应变响应既取决于其当前状态，也取决于达到该状态所遵循的加载历史，特别是当前和先前加载路径的相对方向。本构土模型的开发，预测这种行为，允许弹塑性变形控制的两个嵌套的运动硬化表面内的一个常规的修改剑桥状态边界面。这个相对简单的模型只需要八个参数，每个参数都有一个合理的基础，并且可以从少量控制良好的应力路径测试中确定。使用该模型预测的土壤行为进行了比较，从三轴应力路径试验的数据。密切的协议证实，土壤行为的基本特征预测的模型。通过比较使用该模型（结合有限元分析）进行的预测，说明了在岩土分析中使用该模型的更广泛的影响。
The stress—strain response of overconsolidated clay depends both on its current state and on the loading history followed to reach that state, in particular the relative directions of the current and previous loading paths. A constitu-tive soil model is developed which predicts this behaviour by allowing elasto-plastic deformations controlled by two nested kinematic hardening surfaces inside a conventional Modified Cam-clay state boundary surface. This relatively straightforward model requires only eight para-meters, each with a rational basis, and which can be determined from a small number of well-controlled stress path tests. Predictions of soil behaviour using this model are compared with data from triaxial stress path tests. The close agreement confirms that the essential features of soil behaviour are predicted by the model. The wider implications of the use of the model in geotechnical analysis are illustrated by compar-ing predictions made using the model (in conjunction with finite element analys...