基于应变能的黄土初始屈服和强度特性试验研究

doi:10.13722/j.cnki.jrme.2017.0120

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摘要

不同应力路径条件下初始屈服和强度特性研究，是原状黄土加卸载准则建立的重要基础，基于应变能–应力矢量长度曲线的双线性化确定土单元初始屈服点方法的思想，利用西安理工大学真三轴仪和高压固结仪，对黄土进行了等p等b和侧限压缩应力路径试验，研究应变能确定黄土初始屈服特性的适用性和三维强度特性。从试验结果分析可知，2种应力路径下，应变能–应力矢量长度关系曲线均呈抛物线型，侧限应力条件下确定的结构屈服压力和对数比容–对数竖向应力曲线双线性化的方法接近；真三轴应力条件下黄土的应变能–应力矢量长度曲线中间段线性化程度不高，定义交叉点附近为土单元的屈服区域，不同b值下该区域呈带状分布。平面上黄土的破坏面为曲边三角形形状，破坏面用Lade准则来描述，随着b值的增加破坏状态时应变能逐渐增大。应变能的方法能够在完全侧限条件和侧限条件下研究黄土的初始屈服和强度特性。

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	陈菲1
	邵生俊1
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	邵帅1

关键词 ：土力学, 黄土, 初始屈服, 应变能, 应力路径, 破坏面

Abstract：

The researches about primary yield and failure properties are significant foundation to establish a loading-unloading criterion for the undisturbed loess under the different stress paths. Bilinear relations between strain energy and the length of stress vector are used for determination of yield point.A series of experiments，including equal p and equal b tests and confined compression tests are conducted by using true triaxial apparatus，developed by Xi¢an University of Technology independently，and high-pressure consolidation apparatus. Applicability of determining primary yield of loess by the strain energyand three strength properties are studied. From the results of experiments，the relationships between strain energy and the length of stress vector are all parabolic. Structural yield pressures determined on the confined situation is consistent with that of bilinear logarithmic relations between specific volume and vertical stress. There is no high degree of linearization in the middle section of curves between strain energy and the length of stress vector on the condition of three dimensional stresses. The yield zones near the intersecting rangement are defined and its distributions are stripped distribution with different b-values. The failure surfaces of loess on theplane are curved-edge-triangle，which is described by lade yield criterion. The method of strain energy is applicative to analyze the primary yield and strength under the condition the confined and unconfined stresses.

Key words： soil mechanics loess primary yield strain energy stress path failure surface

引用本文:

陈菲1，邵生俊1，2，邵帅1. 基于应变能的黄土初始屈服和强度特性试验研究[J]. 岩石力学与工程学报, 2017, 36(S2): 4151-4158.
CHEN Fei1，SHAO Shengjun1，2，SHAO Shuai1. Experimental study on primary yield and strength characteristics of loess based on strain energy. , 2017, 36(S2): 4151-4158.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.0120 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS2/4151

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