拉应力条件下岩石细观力学本构模型和渗透系数张量研究(I):各向异性损伤本构模型

Study on constitutive model and permeable coefficient tensor of rock under tensile load with micromechanics(I): Anisotropic constitutive model

在拉应力作用下的考虑渗流的岩石本构模型研究尚且很少。采用细观力学研究了岩石损伤变形过程,考虑了渗流过程。由于选用了新的微裂纹扩展准则,提高了解方程效率;采用细观力学成果建立了考虑渗流的微裂纹面不连续变形对岩石变形影响规律,并采用断裂力学成果建立了考虑渗流的微裂纹应力强度因子;建立了同时考虑微裂纹扩展过程和渗流过程的岩石各向异性损伤本构模型,该模型也适用于岩体。

There are a few paper discussed establishing constitutive models of seeping rock under tensile load until now. In this paper, micromechanics is used to establish a constitutive model of seeping rock under tensile load. The equations during establishing the constitutive models are improved because of using new extending rule for microcrack. New achievements in micromechanics are used to set up the macroscopical distortion caused by microcracks in seeping rock, and achievements in fracture mechanics are used to give out the stress intensity factors. An anisotropic constitutive model for seeping damage rock is established. The model can be applied to rock mass too.