›› 2011, Vol. 32 ›› Issue (S2): 42-50.

• 基础理论与实验研究 • 上一篇    下一篇

黄土结构性力学特性研究与应用的探讨

邵生俊,陶 虎,许 萍   

  1. 西安理工大学 岩土工程研究所,西安 710048
  • 收稿日期:2011-04-11 出版日期:2011-08-10 发布日期:2011-08-26
  • 作者简介:邵生俊,男,1964年生,博士,教授,博士生导师,主要从事土动力学与黄土力学方面的研究工作
  • 基金资助:

    国家自然基金项目(No. 10872161);教育部高等学校博士学科点专项科研基金(No. 20106118110011)。

Discussion on research of mechanical characteristics of loess considering structural behavior and its application

SHAO Sheng-jun, TAO Hu, XU Ping   

  1. Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an 710048, China
  • Received:2011-04-11 Online:2011-08-10 Published:2011-08-26

摘要: 大孔隙、高孔隙比、欠压密的非饱和黄土具有显著的结构性,结构性是影响土力学性质的关键因素。在讨论土结构性力学特性研究途径的基础上,从反映土的结构可稳性和可变性的综合结构势出发,阐述了反映力、水作用的黄土压缩变形结构性参数、应力结构性参数和应力比结构性参数,以及与土的物理性质指标对应的反映结构特征的构度。通过黄土的单轴抗压试验、非饱和直接剪切试验、三轴试验和真三轴试验,揭示了结构性参数和构度的变化规律,以及它们分别与强度指标之间的关系,提出了湿、剪变形过程等结构性临界状态的概念。将正常固结土视为结构性参数或构度等于1的无结构性土,在修正剑桥模型的基础上,考虑临界状态线和等向压缩曲线随结构性参数的变化,建立了结构性屈服面方程,为建立结构性弹塑性本构方程打下了基础。同时,阐述了黄土隧道围岩和黄土地基稳定性分析中应用结构性强度变化规律研究成果的途径,深化了黄土体稳定性分析的理论基础。

关键词: 黄土, 结构性参数, 构度, 强度与本构模型, 应用途径

Abstract: Unsaturated loess with large pores, large void ratio and under-consolidation has significantly structural behavior, affecting its mechanical properties. Based on the discussion of researching approaches on soil structural mechanics characteristics, the structural index reflecting the initial structure behavior and structural parameters reflecting the variation of structure behavior under loading and watering is expressed by the comprehensive structure potential concept, which reflecting the stability to maintain soil structure unchanging and variability to perform structural property after breakage. The compression deformation structural parameters stress structural parameters and stress ratio structural parameters of loess, and its structural index being corresponding to the structural character of soil physical properties are also discussed respectively. Through the confining compressive experiment, unsaturated soil direct shearing test, triaxial test and true triaxial test, three structural parameters changing with water content and shear strain and structural index changing with water content, as well as the structural strength and compressive characteristics are determined by the loess experimental results. The structural equivalence critical state concept is proposed by the Mohr-Coulomb criterion considering the strength index changing with structural parameter under wetting and shear action. Because of the shear strength of normal consolidation soil being uniquely corresponding to its effective stress and density, the normal consolidation soils can be considered as the special soil without structural behavior and its structural parameter or structural index identically equal to 1. On the basis of modified Cam-clay model, the structural shear yield surface equation is established by considering the critical state line and isotropic compression yield stress changing with the structural parameters, so as to lay the solid foundation to study the structural elastoplastic constitutive model. At the same time, it is also discussed how to apply the strength law considering structural behavior of loess in the stability analysis of loess mass surrounding tunnel, supporting force determination of lining structure, settlement and bearing capacity analysis of loess foundation, so as to deepen loess mechanics theory

Key words: loess, structural parameter, structural index, constitutive model, application approach

中图分类号: 

  • TU 411
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