岩土力学2011，Vol.32Issue(3)：647-654,8.
考虑体积变化影响的岩石应变软硬化损伤本构模型及参数确定方法
Strain softening and hardening damage constitutive model for rock considering effect of volume change and its parameters determination method
摘要
Abstract
Aiming at the limitations and deficiencies of the current rock damage models, firstly, the rock under stress is divided into three part abstracly: voids, damaged and undamaged material.The voids ratio is employed to describe rock's change of the volume and the voids; and the damage variable or damage coefficient is used to reflect the conversion degree of mechanical property and state of rock.Then, a new damage model for rock is proposed according to analysis of microcosmic stress and discussion on the relationship between rock's macrocosmic stresses and strains.Secondly, starting with the discussion on the reasonable method to measure the rock microcosmic elemental strength, a statistical damage evolution model for rock to reflect the effect of the damage threshold value is presented by working in statistical damage theory; moreover, a statistical damage constitutive model to simulate the rock full deformation process and its parameters determination method is developed.This model can reflect the properties of not only strain softening or hardening but the volume compression in initial as well as expansion in later.Finally, the analysis and discussion with practical example indicates the rationality and feasibility.关键词
岩石力学/统计损伤/本构模型/初期压密/后期扩容/损伤阀值Key words
rock mechanics/ statistical damage/ constitutive model/ volume compression in initial/ volume expansion in later/ damage threshold value分类
建筑与水利引用本文复制引用
曹文贵,赵衡,张永杰,张玲..考虑体积变化影响的岩石应变软硬化损伤本构模型及参数确定方法[J].岩土力学,2011,32(3):647-654,8.基金项目
国家自然科学基金(No.51078137 ) （No.51078137 ）
高等学校博士学科点专项科研基金(No.20090161110005)资助项目 （No.20090161110005）
教育部博士研究生学术新人奖资助项目. （）
