层状岩体损伤演化与应变关系的研究.pdfVIP

第 25 卷 第 2 期 岩石力学与工程学报 Vol.25 No.2 2005 年 2 月 Chinese Journal of Rock Mechanics and Engineering Feb. ，2005 层状岩体损伤演化与应变关系的研究 刘 立，朱文喜，路军富，梁 伟，李 月 (西华大学 建筑与土木工程学院，四川 成都 610039) 摘要：运用电子显微镜研究了岩石的微观结构，提出岩石微结构损伤模型；对层状岩体进行损伤演化与破坏过程 的研究，建立本构方程与损伤演化方程；引入损伤变量及损伤扩展系数，建立符合岩体整个损伤演化过程的方程， 描述岩石受载过程中初期近似呈线性，随后加速的过程。将岩体损伤与破坏过程分为 3 个阶段，分析层状岩体的 损伤演化与破坏特征及其稳定性，解释岩石损伤演化的规律。研究结果表明：层状岩体的损伤萌生与扩展直到破 坏，除与加载大小、速率等有关外，还与各亚层损伤演化规律、载荷与层面夹角、各亚层的内部微结构特性等有 关。因此，现场整体岩层受其影响是显著的。 关键词：岩石力学；微结构；损伤演化；本构方程 中图分类号：TU 452，TD 313 文献标识码：A 文章编号：1000 –6915(2006)02 –0350 –05 RESEARCH ON RELATION BETWEEN DAMAGE EVOLUTION AND STRAIN OF STRATIFIED ROCK LIU Li ，ZHU Wen-xi ，LU Jun-fu ，LIANG Wei ，LI Yue (School of Architecture and Civil Engineering ，Xihua University ，Chengdu，Sichuan 610039，China) Abstract ：The microstructure of rock is researched by means of scanning electron microscope(SEM) ，and a damage model of rock microstructure is proposed. The damage evolvement and breakage process of stratified rock are studied ；and the constitutive equations and damage equations are established. The damage variable and damage enlarging variable are used to set up the equations for the whole evolvement of damage and to describe the initial approximate linearity and later accelerating process in rock mass. The damage evolvement and breakage process of rock mass are divided into three phases. The damage evolvement，breakage characteristics and stability of stratified rock are analyzed ；and the regularity of damage evolution of rock is explained. The research shows that the appearance and breakage of stratified rock are related not only to load and its rate ，but also to the