摘要
利用SLB-1型应力应变控制式三轴剪切渗透试验仪,对陕西关中地区某地原状黄土进行了应力和应变控制的常规三轴压缩、减压三轴压缩和等p应力路径的各向等压固结排水三轴试验,探讨和分析应力路径对黄土的强度、变形特性的影响。试验结果表明：不同应力路径下土的应力应变关系均符合邓肯-张模型,且在主应力差达到200-250kPa时均出现明显的拐点;但其强度指标随应力路径和控制方式的不同而不同;体变在各应力路径下均表现出很好的线性关系。
Using the SLB-1 triaxial and permeability apparatus with stress and strain Control triaxial,tests with stress and strain control have been carried on the intact loess of Shaanxi Fufeng,the tests were carried out under consolidated drained condition with different stress paths,which include conventional triaxial compression,reduced triaxial compression and with constant p.The influence of different stress path on strength and deformation characteristic of loess is studied.The experiment results indicated that,under different stress path,the stress-strain relationship of the loess agrees with Duncan-Chang model,and at the primary stress difference reaching 200～250kPa,obvious knee point appears on the curve;but its peak strength differs with stress path and control mode.The volumetric strain in all stress paths present good linear relationship.
出处
《地下空间与工程学报》
CSCD
2007年第6期1064-1068,共5页
Chinese Journal of Underground Space and Engineering
基金
教育部新世纪优秀人才支持计划(2006)项目
西北农林科技大学青年学术骨干支持计划(2006)项目
关键词
原状黄土
应力路径
应力应变
强度
变形
intact loess
stress path
stress-strain
strengh
deformation
