基于扰动状态概念的陇东Q_3结构性黄土本构模型试验研究  

Experimental study on constitutive model of structural Q_3 loess in Longdong area based on concept of disturbance state

作　　者：褚峰 邵生俊 CHU Feng;SHAO Shengjun(School of Urban Planning and Municipal Engineering,Xi＇an Polytechnic University,Xi＇an,Shaanxi 710048,China)

机构地区：[1]西安工程大学城市规划与市政工程学院,陕西西安710048

出　　处：《岩石力学与工程学报》2018年第9期2180-2188,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(41272320);西安工程大学博士科研启动基金资助项目(BS1705)~~

摘　　要：陇东Q_3黄土具有显著的结构特征,深入研究其力学变形特征,进而提出合适的本构模型对于理论研究及实际工程建设均具有重要意义。基于扰动状态概念,提出陇东Q_3结构性黄土的本构模型,通过三轴剪切试验,结合原状黄土及对应的饱和正常固结黄土应力–应变曲线和体变曲线,分别提出反映球应力扰动及剪应力扰动的体应变扰动因子D_p和剪应变扰动因子D_q,以根据相关测试结果建立扰动状态函数表达式,函数表达式中的参数可以通过三轴等向压缩试验及三轴剪切试验求得。通过相关验算证明,模型可较理想地模拟黄土在受荷扰动条件下的变形特性。Q3 loess in Longdong has pronounced structural characteristics.Studying its mechanical deformation characteristics and deducing a suitable constitutive model are of theoretical and practical interest.A new constitutive model for Q3 loess fromLongdong is presented based on the concept of disturbed state.The volumetric strain disturbance factor Dp and the shear strain disturbance factor Dq are proposed according to the experimental results.A function to describe the disturbed state is established according to the experimental results.The constitutive model proposed is relatively simple and it′s parameters can be obtained through triaxial isotropic compression test and triaxial shear test easily.Compared with the modified Cambridge model through the test curve and the calculated curve,it is proved that the constitutive model proposed can describe deformation characteristics of loess reasonably.

关 键 词：土力学 陇东地区 结构性黄土 扰动状态概念 扰动因子 本构模型 

分 类 号：TU411[建筑科学—岩土工程]