Journal of South China University of Technology (Natural Science Edition) ›› 2021, Vol. 49 ›› Issue (4): 39-46.doi: 10.12141/j.issn.1000-565X.190937

Special Issue: 2021年土木建筑工程

• Architecture & Civil Engineering • Previous Articles     Next Articles

Egg-Shaped Strength Criterion on the  Plane for Geotechnical Engineering Materials

JIANG Jiaqi1,2 XU Riqing1,2 YU Jianlin1,2 CHEN Wenxiang3 ZHAN Xiaobo4 WANG Yue4 QIU Zhijian5 CHENG Guangmou5   

  1. 1. Research Center of Coastal and Urban Geotechnical Engineering，Zhejiang University，Hangzhou 310058，Zhejiang，China；
    2. Engineering Research Center of Urban Underground Space Development of Zhejiang Province，Hangzhou 310058，
    Zhejiang，China；3. Hongrun Construction Group Co.,Ltd.，Hangzhou 310000，Zhejiang，China；
    4. Zhongtian Construction Group Co.,Ltd., Hangzhou 310008，Zhejiang，China；
    5. Hangzhou Metro Group Co.,Ltd.，Hangzhou 310020，Zhejiang，China
  • Received:2019-12-30 Revised:2020-08-05 Online:2021-04-25 Published:2021-04-01
  • Contact: 蒋佳琪（1990-），男，博士，主要从事软土工程性质与本构模型等研究。 E-mail:jiangjiaqi@zju.edu.cn
  • About author:蒋佳琪（1990-），男，博士，主要从事软土工程性质与本构模型等研究。
  • Supported by:
    Supported by the National Natural Science Foundation of China(41672264) and the Key Research and Development Program of Zhejiang Province(2019C03103)

PDF

93

Abstract: Yield and failure properties on the deviatoric plane for geotechnical engineering materials under three-dimensional stress state are characterized by anisotropy, which can not be reflected by most classical strength criteria. This paper extended the egg-shaped function from the meridional plane to the  plane and proposed the egg-shaped strength criterion for the deviatoric plane. Only 2 parameters α2 and β are required, which represent the curvature of egg-shaped function and the ratio of triaxial tensile strength to triaxial compressive strength, respectively. First of all, the feasibility of the egg-shaped function as yield/failure envelopes of deviatoric plane was mathematically demonstrated. Then the validity of the egg-shaped criterion was then analyzed and discussed combined with the results of several true triaxial tests. The numerical results show that the egg-shaped function can well simulate the strength envelopes with different geometric types depend on the defining parameters. When β is well determined, the egg-shaped function can successfully reproduce the test results as well as some other g(θ) expressions including the SMP criterion. And as α2 approaches 0, the egg-shaped strength envelope tends to be consistent with the SMP criterion. When it approaches 1, the egg-shaped strength envelope tends to be consistent with that of the Mohr-Coulomb criterion.

Key words: egg-shaped function, plane, strength criterion, true triaxial test