基于三轴试验的湿陷性黄土增湿力学特性研究  

Research on the Collapsible Loess's Humidifying Mechanical Properties Based on the Triaxial Tests

作　　者：欧湘萍[1] 李瑭[1] 陈明廉 朱云升[1] 郭进军[3] 丁葵 尹航[1] 吕乃芝 

机构地区：[1]武汉理工大学交通学院,武汉430063 [2]甘肃长达路业有限责任公司,兰州730030 [3]洛阳理工学院,洛阳471023 [4]宁波市交通规划设计研究院,宁波315192

出　　处：《武汉理工大学学报》2016年第6期49-54,共6页Journal of Wuhan University of Technology

基　　金：甘肃省科技重大专项项目(1302GKDA009)

摘　　要：为研究湿陷性黄土的增湿力学特性以减少或避免黄土地区的工程灾害和事故,在不同围压下对不同含水率土样进行了固结不排水剪切试验,对湿陷性黄土在增湿条件下的偏应力-应变特性、抗剪强度特性进行了探究,发现含水率和围压对土的力学特性影响较大,且黏聚力与含水率的相关性远高于内摩擦角与含水率的相关性。采用邓肯提出的双曲线模型和刘祖典提出的幂函数模型分别模拟试样的软化和硬化特性,对比可知建立的模型在某种程度上能够反映湿陷性黄土的增湿力学特性。In order to reduce or avoid the disasters and accidents in loess area, the collapsible loess＇s humidifying mechanical properties were studied by making triaxial consolidation undrained shear tests under different surrounding pressures and water contents. Furthermore, the collapsible loess＇s principal stress difference and strain relation along with the shear strength characteristics of collapsible loess were analyzed. It was found that water content and confining pressure have a great influence on the mechanical properties of collapsible loess, and the correlation between cohesion and water content was much higher than that between internal friction angle and water content. Moreover, the hyperbola model proposed by Duncan and the power function model proposed by Liu Zudian were respectively used to simulate the softening and hardening characteristics of the specimen. Eventually, it was shown that the established models could reflect the humidifying mechanical properties of collapsible loess to a certain extent.

关 键 词：湿陷性黄土 增湿 三轴试验 本构模型 

分 类 号：U411[交通运输工程—道路与铁道工程]