摘要
针对扰动作用下岩石存在初始缺陷的特点,通过探讨含初始缺陷岩石变形力学特征,根据含初始缺陷岩石弹性模量的变化情况,建立了初始损伤的确定方法。然后,引入几何损伤理论,通过分析三轴压缩条件下岩石损伤演化规律,建立了含初始缺陷岩石损伤模型,进而建立了考虑初始缺陷与弹性模量的岩石统计损伤本构模型,并给出了参数的确定方法。最后,通过砂岩三轴压缩试验资料分析得出:本文理论模型能够反映不同围压作用下含初始缺陷岩石的变形破坏全过程,与试验曲线较为接近;且常见损伤模型是本文理论模型的特例,表明本文模型和方法具有一定的合理性与可行性。
According to the characteristics of the initial imperfections in rocks under disturbance,the deformation characteristics of rocks with initial defects are discussed.The determination method of initial damage is established based on changes of elastic modulus of rocks with initial defects.Then,the geometric damage theory is introduced,and the damage model of rocks with initial defects is established by analyzing the damage evolution law of rocks under triaxial compression condition.The statistical damage constitutive model of rocks considering initial defects and elastic modulus is established,and the methods for determining the model parameters are given.Finally,through analyzing the test data of sandstone under triaxial compression condition,the theoretical model reflects the whole process of deformation and failure of rocks with initial defects under different confining pressures,which are close to the experimental curves,and the common damage model is a special case of the theoretical model in this paper.The rationality and feasibility of the model and method are verified.
作者
张超
杨期君
曹文贵
Zhang Chao;Yang Qijun;Cao Wengui(Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring,Hunan University of Science and Technology,411201,Xiangtan,China;Geotechnical Engineering Institute of Hunan University,410082,Changsha,China)
出处
《应用力学学报》
CAS
CSCD
北大核心
2020年第1期286-292,I0020,共8页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金(51878270)
湖南省自然科学基金(2018JJ3163)
湖南科技大学博士科研启动基金项目(E51858)
湖南省教育厅科学研究项目(17C0651)
关键词
岩石
初始缺陷
弹性模量
损伤
本构模型
rock
initial imperfection
elastic modulus
damage
constitutive model
