水文地质工程地质2018，Vol.45Issue(3)：49-55,7.DOI:10.16030/j.cnki.issn.1000-3665.2018.03.06
主动围压下花岗岩动态力学特性与本构模型研究
A study of the dynamic properties and constitutive model of granite under active confining pressures
摘要
Abstract
In order to study the dynamic characteristics and constitutive behavior of granite under different confining pressures and different strain rates,experimental tests were conducted by using the improved Split Hopkinson Pressure Bar (SHPB),and a damage statistical theory was introduced into the Poynting model.The constitutive model and the experimental data were fitted and analyzed,and then the influence of each parameter in the model on the stress-strain curve was discussed.The results show that the confining pressure and the strain rate can enhance the compressive strength of the granite,both of which are positively correlated with the dynamic increase factor of the specimen,and the presence of confining pressure increases the plastic property of the rock specimen and a plastic yield platform appears on the stress-strain curve.The elastic modulus of the specimen under the active confining pressure is improved,but generally there is no obvious rate effect and confining pressure effect.The predicted results of this model are in good agreement with the measured stress-strain curves of the specimen under different confining pressures.关键词
花岗岩/围压/应变率/动力行为/本构模型Key words
granite/confining pressure/strain rate/dynamic behavior/constitutive model分类
建筑与水利引用本文复制引用
李鸿儒,王志亮,郝士云..主动围压下花岗岩动态力学特性与本构模型研究[J].水文地质工程地质,2018,45(3):49-55,7.基金项目
国家自然科学基金资助项目(51579062 （）
51379147) （）
