重塑粉质黏土的剪切蠕变特性及本构模型研究  

Research on Creep Characteristics and Creep Model of Reconstituted Silty Clay

作　　者：胡敏云[1] 肖斌[1,2] 吴书崇 周培娇 Hu Minyun;Xiao Bin;Wu Shuchong;Zhou Peijiao(Institute of Geotechnical Engineering, Zhejiang University of Technology, Hangzhou 310014, P.R. China;Zhejiang Tongji Vocational College of Science and Technology, Hangzhou 311231, P.R. China;Zhefiang Guangsha College of Applied Construction Technology, Jinhua , Zhefiang 322100 ,P.R. China)

机构地区：[1]浙江工业大学岩土工程研究所,杭州3100146 [2]浙江同济科技职业学院,杭州311231 [3]浙江广厦建设职业技术学院,浙江金华322100

出　　处：《地下空间与工程学报》2018年第2期332-340,共9页Chinese Journal of Underground Space and Engineering

基　　金：浙江省自然科学基金(LY13E080015)

摘　　要：通过室内三轴试验,对重塑粉质黏土的剪切蠕变特性进行研究,分析了粉质黏土在不同偏应力水平下和不同偏应力分级方式下的蠕变变形特性。试验表明,粉质黏土的偏应变蠕变变形与对数时间关系具有明显的非线性;在同样的剪切应力水平下,不同的加载分级方式对试样的最终偏应变量有明显的影响,加载分级越多,最终的偏应变量越小。基于试验数据,建立了适合描述重塑粉质黏土蠕变特性的双曲线模型,并对模型参数的物理意义和取值方法进行了讨论。分析表明,模型参数的取值与应力水平及试样的初始孔隙比有关;结合试验结果,给出了粉质黏土剪切蠕变双曲线模型参数取值建议。Triaxial tests were carried out under different shear stress level and with different loading stages to investigate the creep behavior of reconstituted silty clay. The results show that the deviatoric strain-lgt curves of the silty clay under different stress levels and with different loading stages are nonlinear,and the higher the shear stress level is,the more deviatoric creep develops. It is also found that the preloading steps have a pronounced effect on the final deviatoric strain development with that the more stages of the loading,the less deviatoric strain evolves. Based on the tests,a hyperbolic model is proposed to describe the creep behavior of the reconstituted silty clay. Two model parameters,both with sound physical meanings,were analyzed according to the test data. It was found that the model parameters are related to the stress level and the initial void ratio of the soil sample. The values of the model parameters were then suggested for silty clay under triaxial shear.

关 键 词：重塑粉质黏土 剪切蠕变 蠕变模型 模型参数 

分 类 号：TU43[建筑科学—岩土工程]