主应力方向诱导风积土各向异性强度准则及试验验证

doi:10.13722/j.cnki.jrme.2022.0684

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摘要为探究岩土材料的各向异性与应力方向性力学行为，以辽西风积土为研究对象，利用空心圆柱扭剪仪(GDS-SSHCA)开展主应力方向角分别为0°，15°，22.5°，30°，45°，60°，67.5°，75°和90°的定向剪切试验，研究不同大主应力方向作用时风积土剪应力–剪应变曲线变化规律和各向异性强度特征。试验结果表明：当?≤30°时，土体的剪切强度随着?的增大而增大；当?＞30°时，土体的剪切强度随着? 的增大而减小。不同大主应力方向定向剪切时风积土试样强度存在显著的各向异性。在试验结果的基础上，基于等效应力思路，采用组构–应力坐标变换，综合考虑应力、组构的大小及应力–组构的方向关系，建立风积土的等效修正各向异性Lade-Duncan准则(EL-D准则)并利用定向剪切试验结果验证所建立的各向异性准则的可靠性。结果表明，所建立的EL-D准则可以较好的描述应力诱导的风积土各向异性强度特征。研究成果可为岩土材料各向异性研究和风积土工程灾害防治提供科学支撑。

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	刘家顺1
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	朱开新1
	蔡燕燕4
	任钰1
	生彦涛1
	刘页龙1

关键词 ：土力学, 主应力方向, 风积土, 各向异性, 等效应力

Abstract：To investigate the anisotropy and stress directional mechanical behavior of geotechnical materials，directional shear tests of aeolian soil with principal stress direction angles of 0°，15°，22.5°，30°，45°，60°，67.5°，75°，and 90° were performed using a hollow cylinder torsion shear apparatus(GDS-SSHCA). The variation law of the shear stress-shear strain curve and anisotropic strength characteristics of aeolian soil under the action of different major principal stress directions are presented. Test results shown that when ?≤30°，the shear strength of soil increases with the increase of ?；when ?＞30°，the shear strength of soil decreases with the increase of ?. Significant anisotropy exists in the strength of aeolian soil samples under directional shearing in different major principal stress directions. Based on the test results，the equivalent modified anisotropic Lade-Duncan criterion (EL-D criterion ) of aeolian soil is established by using the fabric-stress coordinate transformation based on the idea of equivalent stress and considering the stress，the size of the fabric，and the direct relationship between the stress and the fabric. The reliability of the established anisotropic criterion is verified by the directional shear test results of aeolian soil. The results show that EL-D criterion established in this paper can better describe the strength characteristics of stress-induced anisotropy in aeolian soil. The research results will provide scientific support for the study of anisotropy of geotechnical materials and the prevention and control of aeolian soil engineering disasters.

Key words： soil mechanics principal stress direction aeolian soil anisotropy equivalent stress

引用本文:

刘家顺1，2，3，朱开新1，蔡燕燕4，任钰1，生彦涛1，刘页龙1. 主应力方向诱导风积土各向异性强度准则及试验验证[J]. 岩石力学与工程学报, 2023, 42(7): 1789-1798.
LIU Jiashun1，2，3，ZHU Kaixin1，CAI Yanyan4，REN Yu1，SHENG Yantao1，LIU Yelong1. Anisotropic strength criterion of aeolian soil under stress path considering the variation of principal stress direction. , 2023, 42(7): 1789-1798.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0684 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I7/1789

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