基于修正Griffith准则的岩石循环加卸载本构研究  

Study on Cyclic Loading and Unloading Constitutive Model of Rock Based on Modified Griffith Criterion

作　　者：罗吉安 李文成 LUO Ji'an;LI Wencheng(School of Mechanics and Optoelectonics Physics,Anhui University of Science and Technology,Huainan,Anhui 232001,China;School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan,Anhui 232001,China)

机构地区：[1]安徽理工大学力学与光电物理学院,安徽淮南市232001 [2]安徽理工大学土木建筑学院,安徽淮南市232001

出　　处：《矿业研究与开发》2021年第12期58-62,共5页Mining Research and Development

基　　金：国家自然科学基金资助项目(52074006);安徽高校自然科学重大研究项目(KJ2018ZD010);深部岩土力学与地下工程国家重点实验室开放基金资助项目(SKLGDUEK1212).

摘　　要：为探究地下工程中岩石在周期荷载作用下的破坏过程,对砂岩进行了多组分等级单轴循环加卸载试验。在假设岩石的微元强度服从修正Griffith准则和微元破坏服从Weibull概率分布的基础上,引入岩石损伤理论,建立了单轴及三轴砂岩损伤本构模型。通过本构模型与试验数据拟合对比,结果表明:拟合效果均在0.99以上,即两者存在较高的相似度,故该模型将能够表述地下工程中岩石在周期荷载作用下的破坏过程,并具有一定的合理性及有效性。另外,对本构模型进行合理修正,得出修正表达式,为研究岩石加卸载破坏过程提供了新的思路。In order to explore the failure process of rocks under periodic loads in underground engineering,multi-component grade sandstone cyclic loading and unloading tests were carried out.Based on the assumption that the infinitesimal strength of the rock obeys the modified Griffith criterion and the failure obeys the Weibull probability distribution,the rock damage theory is introduced to establish uniaxial and triaxial sandstone damage constitutive models.Through the comparison and fitting of constitutive model and test data,the results are concluded as follows.The fitting effect is above 0.99,that is,there is a high similarity between the two.Therefore,the model will be able to describe the failure process of rocks under the action of periodic load in underground engineering,and has a certain rationality and effectiveness.In addition,a reasonable modification of the constitutive model and a modified expression will provide a new idea for studying the failure process of rock loading and unloading.

关 键 词：循环加卸载 修正Griffith准则 损伤理论 本构模型 WEIBULL分布 

分 类 号：TU457[建筑科学—岩土工程]