考虑损伤修正的岩石统计损伤本构模型研究  

Study on Statistical Damage Constitutive Model of Rock Considering Damage Modification

作　　者：杨宇生 尹前锋 丰丛杰 贾洪彪[1] YANG Yu-sheng;YIN Qian-feng;FENG Cong-jie;JIA Hong-biao(Engineering Institute,China University of Geosciences,Wuhan Hubei 430074,China;College of Earth and Planetary Science,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国地质大学工程学院,湖北武汉430074 [2]中国科学院大学地球与行星科学学院,北京100049

出　　处：《安徽理工大学学报（自然科学版）》2018年第4期70-74,共5页Journal of Anhui University of Science and Technology:Natural Science

摘　　要：为研究岩石本构关系,基于连续损伤理论和统计强度理论,考虑岩石内部存在随机分布的微裂隙等缺陷,对Harris函数进行改进作为岩石微元强度概率密度分布函数,考虑岩石材料的渐进破坏性,提出了损伤变量修正系数δ,以岩石轴向应变作为微元强度随机分布变量,建立岩石损伤统计本构模型,运用曲线拟合法,结合相关试验参量,确定模型参数。通过对比实验数据点与本构模型曲线,验证该模型的合理性和可行性,并探讨损伤变量修正系数的不同取值对本构模型的影响,为理论研究和实际工程提供参考。According to continuous damage theory and statistical strength theory, the Harris function was improved as the probability density distribution function of the rock microelement strength by taking into account the defects such as random micro-cracks in the rock; and damage variable correction coefficient δ was proposed by taking into account the progressive destructiveness of rock material. Upon those bases,a statistical constitutive model of rock damage was established by taking the axial strain of rock as a random distribution variable of microelement strength;The model parameters were determined by curve fitting method and by referring to some test parameters. By comparing the experimental data points and the constitutive model curve, the rationality and feasibility of the model were verified, and the influence of the different values of the damage variable＇s correction coefficients on the constitutive model was discussed, which provides a reference for the theoretical research and practical engineering.

关 键 词：岩石 损伤 损伤变量修正系数 本构模型 

分 类 号：TU45[建筑科学—岩土工程]