含水层饱和砂土蠕变试验及流变模型辨识研究  

Creep Experimental Study on Aquifer Saturated Sandy Soil and Rheological Model Identification

作　　者：杨伟涛 徐进[1] 王少伟 YANG Wei-tao;XU Jin;WANG Shao-wei(School of Civil Engineering,Yantai University,Yantai 264005,China)

机构地区：[1]烟台大学土木工程学院,山东烟台264005

出　　处：《烟台大学学报（自然科学与工程版）》2020年第3期354-359,共6页Journal of Yantai University(Natural Science and Engineering Edition)

基　　金：国家自然科学基金资助项目(41602284);烟台大学研究生科技创新基金资助项目(YDZD2006).

摘　　要：利用高压固结仪和梯度加载方法,对地面沉降地区的含水层砂土进行了室内蠕变试验,分别得到了多级荷载下应力-应变长期关系曲线与应力-应变等时曲线.试验结果表明:与弱透水层的黏性土一样,含水层砂性土也具有典型的蠕变特征,而且这种蠕变性与应力水平有关,在双对数坐标系中表现出明显的线性特点.在此基础上,利用Matlab编写了计算程序,对试验数据进行了参数反演和模型识别,获得了能够反映含水层砂土蠕变特性的最优黏弹性流变模型.The laboratory creep tests of aquifer sand,which is sampled from land subsidence area,are conducted by using high-pressure consolidation apparatus and gradient loading method,then the long-term stress-strain relationship curves and isochronous stress-strain curves under multi-level load are obtained respectively.The experiment results demonstrate that,like the clayey soil from weak-permeability layers,aquifer sand also shows the typical creep characteristic which is related to stress level with obvious linearity in a double logarithmic coordinate.Based on the experimental results,the parameters inversion and model identification on the test data are carried out by a computation program developed with Matlab,and the optimal viscoelastic rheological model which can describe the creep characteristic of aquifer sand is identified.

关 键 词：地面沉降 含水层 饱和砂性土 蠕变试验 流变模型 

分 类 号：TU441[建筑科学—岩土工程]