摘要
通过三轴蠕变试验,研究了糯米浆掺入量对人工制备遗址土三轴蠕变特性的影响。试验结果表明,在添加了一定量的糯米浆后,人工制备遗址土三轴蠕变量明显减小,稳定时间增长。随着添加糯米浆质量的增加,人工制备遗址土的蠕变量呈现出先减小后增大的趋势,在土与糯米浆质量比为90∶10时,蠕变量达到最小。人工制备遗址土三轴蠕变具有明显的非线性,时间越长,非线性越强。将总的变形分解为线性黏弹性变形、线性黏塑性变形和非线性黏塑性变形,利用模型理论描述其线性应变部分,非线性部分采用经验公式,建立了适合人工制备遗址土三轴蠕变特性的非线性半经验半理论黏弹塑性蠕变本构模型。该模型能较好的描述人工制备遗址土三轴蠕变特性,此非线性蠕变模型以元件模型为骨架,经验公式是对理论模型的非线性修正,具有较高的适用性。
Through the triaxial creep tests,the influences of the mixing amount of glutinous rice slurry on the triaxial creep characteristics of artificially prepared relic soil are studied.The test results show that after adding a certain amount of glutinous rice slurry,the triaxial creep of the artificially prepared ruins soil is significantly reduced,and the stable time increases.With the increase in the quality of the glutinous rice slurry,the creep value of the artificially prepared ruins soil shows a trend of first decreasing and then increasing.When the mass ratio of soil to glutinous rice slurry is 90∶10,the creep value reaches the minimum.The triaxial creep of artificially prepared relic soil has obvious nonlinearity,and the nonlinearity becomes stronger with time.The total deformation is decomposed into linear viscoelastic deformation,linear viscoplastic deformation and nonlinear viscoplastic deformation.The linear strain part is described by the model theory,and the nonlinear part adopts empirical formulas to establish the nonlinear,semi-empirical and semi-theoretical viscoelastic-plastic creep constitutive model,suitable for artificial preparation of site soil.This model can better describe the triaxial creep characteristics of artificially prepared site soils.This nonlinear creep model is based on the element model.The empirical formula is a nonlinear correction of the theoretical model and has high applicability.
作者
胡再强
王凯
李宏儒
梁志超
焦韩伟
吴朋
陈振鹏
HU Zai-qiang;WANG Kai;LI Hong-ru;LIANG Zhi-chao;JIAO Han-wei;WU Peng;CHEN Zhen-peng(Institute of Geotechnical Engineering,Xi'an University of Technology,Xi'an 710048,China;Xi'an Engineering Investiyation&Design Research Institute of China National Nonferrous Metals Industry Co.Ltd.,Xi'an 710054,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2021年第S01期13-18,共6页
Chinese Journal of Geotechnical Engineering
基金
陕西省自然科学基础项目(2017JM5059)
陕西省黄土力学与工程重点试验室项目(13JS073)
西北旱区生态水利国家重点试验室项目(QNZX-2019-07)
关键词
人工制备遗址土
蠕变
非线性半经验半理论
黏弹塑性蠕变本构模型
artificially preparaed site soil
creep
nonlinear semi-empirical semi-theory
visco-elastoplastic creep constitutive model
作者简介
胡再强(1964—),男,教授,博士生导师,主要从事黄土力学与工程及数值计算方面的教学与研究工作。E-mail:huzq@xaut.edu.cn。
