基于扰动状态概念的陇东Q3结构性黄土本构模型试验研究

doi:10.13722/j.cnki.jrme.2018.0206

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摘要陇东Q3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Q3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Dp和剪应变扰动因子Dq，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。

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	褚峰
	邵生俊

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

Abstract：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 from Longdong 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.

Key words： soil mechanics Longdong area structural loess disturbed state concept disturbance factor constitutive model

引用本文:

褚峰，邵生俊. 基于扰动状态概念的陇东Q3结构性黄土本构模型试验研究[J]. 岩石力学与工程学报, 2018, 37(9): 2180-2188.
CHU Feng，SHAO Shengjun. Experimental study on constitutive model of structural Q3 loess in Longdong area based on concept of disturbance state. , 2018, 37(9): 2180-2188.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0206 或 http://www.rockmech.org/CN/Y2018/V37/I9/2180

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