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冰川冻土  2013 

冻土三轴蠕变非线性数学模型研究

DOI: 10.7522/j.issn.1000-0240.2013.0020, PP. 171-176

Keywords: 冻黏土,蠕变,温度敏感性,非线性数学模型,参数

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Abstract:

采用MTS-810液压伺服材料试验机,对人工配制的冻黏土试件进行了三轴蠕变试验,获得了冻黏土在复杂应力状态下的蠕变曲线.结果表明冻土的蠕变变形具有较强的温度敏感性,温度越高,这种温度敏感性越强;相同温度下,荷载越大,变形越大.运用相关理论,推导了冻黏土在复杂应力状态下的三轴蠕变非线性数学模型,采用MATLAB软件的数据拟合功能得到了模型方程参数的数值,模型参数与温度之间存在密切关系,建立了二者之间的数学表达式.冻土三轴蠕变非线性数学模型的曲线与试验曲线拟合精度较高,建立的数学模型可以精确体现冻土的蠕变规律,能够为实际冻土工程的变形发展预测提供有效的理论指导.

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