岩质材料非线性流变属性及其力学模型

Nonlinear Rheological Property of Rock Materials and Mechanical Model

本文在苏联学者S.S.Vyalov对岩质材料非线性流变研究的基础上,进一步改进和完善S.S.Vyalov的研究假设,提出本文所建议并采用的研究岩质材料非线性流变属性的力学模型,并通过对泥岩和砂岩材料分别进行了不同剪应力和轴向压应力条件下的直剪蠕变与单轴压缩蠕变试验,验证了力学模型的正确性。研究表明:一些岩质材料在各类加载条件下,其粘滞系数值是加载应力大小和加载持续作用时间的非线性函数。

This paper is based on S. S. Vyalov's research on the nonlinear rheological property of rock materials. The rectified hypothesis is put forward in the paper, which makes much more reasonable than Vyalov's. Then, the new mechanical model which is used to study the nonlinear rheological property of rock materials is set up. According to the results of the tests of sandstone and mudstone samples, the mechanical model is proven to be rational. Through the research, the value of the viscosity coefficient under the condition of the different loading shows the nonlinear function of the loaded stress and the elapsing of time.