摘要
外部荷载与基质吸力的耦合作用使得非饱和土本构关系的构建极为复杂。本文首先开展了非饱和土的加载试验及脱湿试验,分析了非饱和土在不同基质吸力与外部荷载作用下的破坏模式及破坏规律。在此基础上,引进统计损伤理论,假定非饱和土是由众多强度服从Weibull随机分布的微元体组成的组合体,同时为考虑外部荷载与基质吸力对非饱和土变形的影响,采用扩展莫尔-库伦准则模拟微元体的承载能力,建立了非饱和土统计损伤演化方程,进而导得非饱和土的统计损伤本构模型,并基于常规试验提出了其主要参数的确定方法。
It is the coupling action between the external load and matric suction that makes the process of building the unsaturated soil constitutive relationship model very complex. Load tests and unsaturated soil moisture test are carried out and the failure of the unsaturated soil under different matric suctions and external loads are analyzed. This paper introduces the statistical damage theory,assumes that the unsaturated soil consists of many microelements（ their strength obeys the Weibull distribution）,and considers the impacts of the external load and matric suction on the deformation of the unsaturated soil,utilizes the extended MohrCoulomb failure criterion to simulate the bear capacity of microelements,establishes an unsaturated soil statistical damage evolution equation,and acquires the unsaturated soil statistical damage constitutive model and proposes a method to determine the main parameters based on conventional tests.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2015年第3期43-48,58,共7页
Hydrogeology & Engineering Geology
基金
国家自然科学基金项目(51278184
50708030)
教育部新世纪优秀人才支持计划(NCET-13-194)
湖南大学青年教师成长资助项目
关键词
非饱和土
本构模型
统计损伤
扩展莫尔-库伦破坏准则
unsaturated soil
constitutive model
statistical damage theory
extended Mohr-Coulomb failure criterion
