冻融循环下考虑塑性损伤演化的饱和岩石本构模型  

Plastic damage evolution-considered constitutive model of saturated rock under freezing-thawing cycle

作　　者：王中明 赵雨霞 祝凤金 WANG Zhongming;ZHAO Yuxia;ZHU Fengjin(Architecture Engineering College,Huanghuai University,Zhumadian 463000,Henan,China;School of Mechanical and Electrical Engineering,Zhoukou Normal University,Zhoukou 466001,Henan,China;The Architectural Design&Research Institute of Zhejiang University Co.,Ltd.,Hangzhou 310028,Zhejiang,China)

机构地区：[1]黄淮学院建筑工程学院,河南驻马店463000 [2]周口师范学院机械与电气工程学院,河南周口100083 [3]浙江大学建筑设计研究院有限公司,浙江杭州310028

出　　处：《水利水电技术（中英文）》2022年第11期155-162,共8页Water Resources and Hydropower Engineering

基　　金：国家重点研发计划项目(2019YFC1509701)。

摘　　要：针对冻融循环下饱和岩石,提出冻融损伤与岩石基质受载塑性损伤耦合的损伤变量计算方法。之后基于修正Drucker-Prager帽盖屈服准则,推导出考虑岩石基质塑性损伤演化的本构模型,而后考虑冻融对岩石力学性能的劣化作用,建立了冻融循环下考虑塑性损伤演化的饱和岩石本构模型。最后采用冻融循环下花岗岩单轴压缩实验结果对所提模型进行了验证。结果表明:(1)冻融循环会造成岩石的初始损伤,且初始损伤随冻融循环次数的增大而增大;(2)岩石基质受载损伤与冻融损伤两者耦合,会增大试件的损伤程度,进而加速岩石力学参数的劣化;(3)模型预测岩石单轴抗压强度随冻融循环次数的增大而降低,理论值与实验值吻合良好,证明了该模型的有效性。A damage variable calculation method for the coupling of freezing-thawing damage with loaded plastic damage of rock matrix is proposed herein for the saturated rock under freezing-thawing cycle,and then a constitutive model considering the plastic damage evolution of rock matrix is derived based on the modified Drucker-Prager Cap yield criterion.After that,a saturated rock constitutive model considering the plastic damage evolution under freezing-thawing cycle is established with considering the deterioration of the rock mechanical properties caused by freezing-thawing cycle.Finally,the proposed model is verified by the uniaxial compression experiments of granite under freezing-thawing cycles.The results show that(1)the initial damage of the saturated rock is caused by freezing-thawing cycle and increases along with the increase of the number of freezing-thawing cycles;(2)the coupling between the loaded plastic damage of rock matrix and freezing-thawing damage can increase the damaging degree of rock specimen and then accelerate the deteriorations of rock mechanical parameters;(3)the uniaxial compressive strength of rock predicted by the model decreases along with the increase of the number of the freezing-thawing cycles,while the theoretical values are better coincided with the experimental ones,thus the effectiveness of the proposed model is certified.

关 键 词：冻融循环 本构模型 塑性损伤 饱和岩石 Drucker-Prager帽盖模型 

分 类 号：TU45[建筑科学—岩土工程]