基于Duncan-Chang模型的湿陷性黄土本构参数取值研究  

On the Constitutive Parameter Values of Collapsible Loess Based on the Duncan-Chang Model

作　　者：刘银[1] 张志强[1] 赵梓彤[1] 李欣[1] 

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,成都610031

出　　处：《现代隧道技术》2016年第6期49-54,共6页Modern Tunnelling Technology

基　　金：国家自然科学基金项目(51478396);国家自然科学基金项目(51678503);四川省科技计划项目(2015GZ0235)

摘　　要：文章基于Duncan-Chang模型,通过进行未含有和含有垂直节理的黄土三轴压缩试验,获得两者的应力—应变关系曲线。研究发现:同一围压下含有及未含有垂直节理的黄土应力—应变关系曲线均集中于较窄范围;经归一化处理所获得窄带内的平均曲线,可综合反映实际工程中黄土的物理力学性质;由平均曲线得到含有垂直节理的黄土应力—应变关系表达式及其参数;最终建立适用于潘涧河隧道Q3黄土的工程实用性模型,可为后续开展湿陷性黄土相关研究奠定基础。Based on the Duncan-Chang Model, the stress-strain relation curves of collapsible loess with or without vertical joints were obtained through triaxial compression tests. The results show that under the same confining pres- sure, the stress-strain curves of collapsible loess with or without vertical joints are concentrated in a narrow range; the average value curve in the narrow band obtained by normalized processing can comprehensively reflect the loess physical and mechanical properties in practical engineering; and the stress-strain relation expression for loess with vertical joints and its relative parameters are given by an average value curve. A practical engineering model suit- able for Q3 loess in the Panjianhe tunnel is established which lays a solid foundation for a follow-up study of collapsible loess.

关 键 词：Duncan—Chang模型 黄土 垂直节理 模型参数 

分 类 号：TU411.5[建筑科学—岩土工程] U452[建筑科学—土工工程]