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(Ⅱ):各向异性渗透系数张量及算例  

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

作　　者：韦立德[1] 杨春和[1] 徐卫亚[2] 

机构地区：[1]中国科学院岩土力学重点实验室,武汉430071 [2]河海大学岩土工程研究所,南京210098

出　　处：《岩土力学》2005年第12期1996-2000,共5页Rock and Soil Mechanics

基　　金：国家重点基础研究发展规划项目(973)(No.2002CB412704);国家自然科学基金(No.50374064;50334060)资助

摘　　要：建立了同时考虑微裂纹发展过程、渗透压和变形影响的岩石各向异性渗透系数张量,推导了所建立本构模型和渗透系数张量的单轴拉伸方程,并和实验结果进行了对比。结果表明,建立的本构模型能够反映岩石的弹性阶段、非线性强化阶段、应力跌落阶段和应变软化阶段的特征;能够很好地反映有渗流时岩石抗拉强度降低等渗流岩石力学特征;建立的渗透系数张量正确反映了随着岩石损伤的发展岩石中渗流的各向异性规律。该模型也适用于岩体。There are a few paper discussed establishing permeable coefficient tensor of rock under tensile load until now. In this paper, an anisotropic permeable coefficient tensor of rock under tensile load, thingking about hydraulic pressure, microcrack extending and distortion, is established. The equations of the theories in previous paper and this paper are deduced for rock under axial tensile loading. The presented models are compared with experimental data. The comparative results show that the constitutive model can reflect all phases of stress-strain curve and the character that hydraulic pressure make rock strength lower. The permeable coefficient tensor can reflect the anisotropy and the evolvement of seepage in rock. The permeable coefficient tensor can be applied to rock mass too.

关 键 词：岩石力学 岩石 渗透系数张量 各向异性 损伤 

分 类 号：TU452[建筑科学—岩土工程]