岩土力学2017，Vol.38Issue(10)：2901-2908,8.DOI:10.16285/j.rsm.2017.10.017
岩石应变软化变形特性及损伤本构模型研究
Characteristics of strain softening of rocks and its damage constitutive model
摘要
Abstract
The uniaxial and conventional triaxial compression tests were conducted on granite from Sanjiang region of Yunnan-Tibet railway in the laboratory.The deformation characteristics and the damage evolution law of rocks were examined under different confining pressures.The results show that the internal cracks experience five stages during the compression deformation process,including no crack,crack initiation and stable propagation,crack accelerating propagation,crack decelerating propagation and crack termination.In addition,confining pressure significantly influences deformation characteristics of rock.Based on the above analysis and the damage model of micro units,a damage constitutive model is developed under the triaxial compression condition.The proposed model has a simple function form and distinct physical meaning parameters,which can be used to describe both the pre-peak and post-peak deformation characteristics of rocks.Furthermore,theoretical results obtained by this model are in good agreement with experimental results in the literature.The rationality of the model is verified by the parameter analysis.关键词
岩石/三轴压缩/应变软化/损伤演化/本构模型Key words
triaxial compression/strain softening/damage evolution/constitutive model分类
建筑与水利引用本文复制引用
刘冬桥,王焯,张晓云..岩石应变软化变形特性及损伤本构模型研究[J].岩土力学,2017,38(10):2901-2908,8.基金项目
国家自然科学基金资助项目(No.51704298) （No.51704298）
北京市共建专项资助项目(No.80044810) （No.80044810）
中央高校基本科研业务费专项资金资助项目(No.2015QB01).This work was supported by the National Natural Science Foundation of China (51704298),the Beijing Education Committee Cooperation Building Foundation Project (80044810) and the Fundamental Research Funds for the Central Universities (2015QB01). （No.2015QB01）
