软土流变特性的室内试验与改进的西原模型

Laboratory Experiment of the Rheological Property of Soft Clay and the Improved Xiyuan Model

详尽描述了软土流变特性的室内直剪实验方法,探讨了实验中需特别注意的加载方法、试样保存以及试验数据读取等一些重要问题.通过对现有流变模型的分析及结合室内直剪蠕变试验结果,用非线性牛顿体替代线性牛顿体,从而对西原正夫模型进行了改进,并导出了改进后模型的本构方程.最后,采用本文改进模型对实验结果进行了非线性分析,获得了相应的实验拟合曲线及模型的参数值,结果表明,理论计算与实测结果吻合良好.

This paper proposed a complete set of laboratory direct shear experimental process and discussed its details about the rheological property of the soft clay, such as the loading method, the preservation of the test sample, the data acquisition and so on. After studying the present rheological models and the experimental data, we put forward an improved Xiyuan model and its constitutive equation to analyze the experimental results by using the non-linear N element to replace the linear one. The final fitting curves and the value of the parameters indicate that the theoretical results coincide with the experimental ones very well.