改进的西元蠕变模型

发布时间：2018-07-14 12:21

【摘要】：为了解决岩土与地下工程施工过程中围岩持续性的蠕变大变形灾害,建立能较好描述岩石蠕变全过程规律的本构方程尤为重要。基于RLW-2000型微机伺服岩石三轴流变仪得到的泥岩流变实验数据,对其蠕变曲线特征进行分析,结合岩石的力学特性,定义了一种能反映岩石加速蠕变破坏特征的非线性函数。将定义的非线性函数引入到传统西元模型中,构造出一个新的改进西元模型的流变本构方程。该模型成功克服了传统西元模型不能描述岩石加速蠕变过程的缺陷,能很好地反映岩石蠕变曲线的三个阶段。结合泥岩蠕变实验数据对该模型的蠕变参数进行了辨识,并将模型的计算结果与蠕变实验数据对比,证明了所建立新的改进西元模型的正确性与合理性。且模型参数较少,容易理解,便于在实际工程中运用和推广。
[Abstract]:It is very important to establish constitutive equation which can describe the whole process of rock creep in order to solve the large creep disaster of surrounding rock during the construction of geotechnical and underground engineering. Based on the experimental data of mudstone rheology obtained by RLW-2000 microcomputer servo triaxial rheometer, the creep curve characteristics of mudstone are analyzed. Combined with the mechanical characteristics of rock, a nonlinear function which can reflect the characteristics of accelerated creep failure of rock is defined. The defined nonlinear function is introduced into the traditional western-element model, and a new rheological constitutive equation of the improved western-element model is constructed. The model successfully overcomes the defect that the traditional Western model can not describe the accelerated creep process of rock and can well reflect the three stages of rock creep curve. The creep parameters of the model are identified based on the experimental data of mudstone creep. The correctness and reasonableness of the new improved model are proved by comparing the calculated results with the creep experimental data. The model parameters are few, easy to understand, and easy to be applied and popularized in practical engineering.
【作者单位】：贵州省公路开发有限责任公司;
【分类号】：TU45

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