基于伯格斯模型的岩石非线性蠕变损伤模型研究  

Study of Nonlinear Creep Damage Model for Rock Based on Burgers Model

作　　者：李忠君 盛冬发 张容国 LI Zhongjun;SHENG Dongfa;ZHANG Rongguo(Civil Engineering Institute,Southwest Forestry University,Kunming 650224,China)

机构地区：[1]西南林业大学土木工程学院,云南昆明650224

出　　处：《河南科技》2022年第23期58-61,共4页Henan Science and Technology

基　　金：国家自然科学基金项目(11862023);云南省教育厅科学研究基金项目(2022Y607)。

摘　　要：为了克服伯格斯模型难以描述岩石加速蠕变特征的不足,在伯格斯模型基础上引入黏塑性损伤体,建立非线性蠕变损伤模型,并推导一维和三维蠕变方程。基于不同应力水平下岩石三轴压缩蠕变试验数据,利用Levenberg-Marquardt算法对蠕变模型进行拟合,反演得到蠕变模型参数。结果表明:非线性蠕变损伤模型能较好地反映岩石蠕变全过程,不同应力水平下试验数据与拟合结果相关系数均在0.971以上,验证了该模型的合理性和适用性。In order to overcome the deficiency of the Burgers model in describing the accelerated creep characteri-stics of rock,a nonlinear creep damage model was obtained by introducing viscoplastic damage bodybased on the Burgers model,then one-dimensional and three-dimensional creep equations were de⁃rived.Based on the triaxial compression creep test data of rocks under different stress levels,the creep model was fitted using the Levenberg-Marquardt algorithm and the creep model parameters were obtained by inver⁃sion.The results show that the nonlinear creep damage model can describe the whole process of rock creep better,and the correlation coefficients between the test data and the fitting results under different stress levels are above 0.971,which verifies the reasonableness and applicability of the model.

关 键 词：岩石力学 非线性 加速蠕变 损伤演化方程 

分 类 号：TU452[建筑科学—岩土工程]