黄土（Q<sub>3</sub>）横观各向同性强度准则研究

许萍; 邵生俊; 张帅

doi:10.11779/CJGE201801011

黄土（Q₃）横观各向同性强度准则研究 English Version

许萍¹,
邵生俊^2, ,,
张帅¹

1.西安理工大学水利水电学院,陕西西安 710048
2.西安理工大学土木与建筑工程学院岩土工程研究所,陕西西安 710048

基金项目: 国家自然科学基金项目（11572245）; 陕西省教育厅重点实验室科研计划项目（17JS092）; 西安理工大学校科技创新计划项目（2016CX021）; 校博士启动金项目（104-2560816023）; 水电学院开放基金项目（2016ZZKT-31）

详细信息

作者简介:
许萍(1986-),女,陕西西安人,讲师,主要从事岩土材料测试及土石坝灾害防治方面的研究工作。E-mail：xuping1986@xaut.edu.cn。

通讯作者:
邵生俊，E-mail：sjshao@xaut.edu.cn

中图分类号: TU444
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出版历程
- 收稿日期: 2017-01-12
- 发布日期: 2018-01-24

Strength criterion of cross-anisotropic Q₃ loess

1.Institute of Water Resources and Hydro-electric Engineering, Xi'an University of Technology, Xi'an 710048, China
2.Institute of Geotechnical Engineering, Xi'an University of Technology, Xi'an 710048, China

摘要

摘要: 针对黄土的竖向裂隙及强化联结与水平面内各向同性的横观各向同性结构,沿竖向分别施加大、中、小主应力,进行了不同固结围压常中主应力比值的固结排水真三轴试验研究。依据八面体平面上应力状态域关于竖向主应力轴的几何对称关系,分析了竖向和任意水平向施加大主应力的3个空间域不同中主应力比值子午平面的强度变化规律,以及黏聚力和内摩擦角随中主应力比值的变化规律;得到了横观各向同性结构黄土在八面体平面上关于竖向主应力轴对称的强度破坏面。在假定沉积面内正交两个主应力轴相对于竖向主应力轴无旋转的条件下,应用Lade提出的竖向主应力轴与沉积面内正交两向主应力对角线轴平面内主应力空间旋转的描述方法,对 $\sqrt[3]{\sigma}-SMP$ 各向同性强度表达式进行修正,建立了横观各向同性的 $\sqrt[3]{\sigma}-SMP$ 强度准则。与黄土试验结果相对比,表明该准则描述横观各向同性黄土的三维空间强度破坏面具有较好的适用性。
- 横观各向同性 /
- 真三轴试验 /
- 强度准则 /
- 黄土
Abstract: The structure of loess consisting of vertically extended cracks and horizontally deposited planes makes the cross-anisotropic strength behavior. In view of this, by using consolidated drained true triaxial tests, three principal stresses are alternatively loaded along the vertical direction. According to the geometric symmetry relation of the vertical principal stress axis in the stress state in the eight planes, the strength variation laws of the meridional plane in the three spatial domains with vertical and arbitrary horizontal forces and the variation laws of cohesion and internal friction angle with the ratio of the principal stress are analyzed, and the failure surface of the loom with transversely isotropic structure on the octahedral plane is obtained. Under the condition that the two principal stress axes are orthogonal to the vertical principal stress axis without orthogonal rotation, based on the theory of the principal stress space rotation proposed by Lade, the existing isotropic strength expression is improved and developed, and a new strength criterion for the rotation of principal stress axis in cross-anisotropic loess is proposed. The essential effectiveness of the new criterion is confirmed by the results of experimental facts.
- cross-anisotropy /
- true traxial test /
- strength criterion /
- loess

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参考文献(14)

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施引文献(10)

期刊类型引用(3)

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3.	郭楠，陈正汉，杨校辉，郭剑峰. 横观各向同性非饱和土的增量非线性本构模型及参数变化规律研究. 岩土工程学报. 2021(12): 2283-2290 . 本站查看