摘要
在大量动静三轴试验的基础上,研究了水泥改良土试样的应力-应变关系,掺和比及围压等影响因素,以及临界动应力、累计塑性应变、弹性应变及回弹模量的变化规律,同时,还研究了水泥土的回弹模量和动弹性应变与振动次数的变化规律.试验结果表明:水泥土的应力-应变曲线呈软化型,存在明显的应力峰值点;动应力存在一个临界值,土体的变形分为衰减型、破坏型及临界型;水泥土的临界动应力是素土的两倍以上,随掺和比的增加而增长,但增长趋势变缓.
Based on lots of static and dynamic tri-axial tests, the variation laws of stress-strain relation- ship, the influence factors of blend ratio and confining pressure, critical dynamical stress, accumulation plastic strain, elastic strain and resilient module of cement soil are studied. Meanwhile, the variation of resilient modulus and elastic strain with load cycles is also researched. The results show that the stress-strain relationship of cement soil is work softening, and with an obvious peak spot. There is a dynamic stress threshold which divides the deformation of soil into decline-state, destructive-state and critical-state. The critical dynamic stress of cement soil is two times more than soil, and slowly increases with the blend ratio.
出处
《北京交通大学学报》
CAS
CSCD
北大核心
2010年第1期64-67,共4页
JOURNAL OF BEIJING JIAOTONG UNIVERSITY
基金
国家自然科学基金(国际合作项目)(50911120080)
北京交通大学校科技基金资助(2008RC041)
关键词
水泥土
应力.应变关系
临界动应力
回弹模量
弹性应变
cement soil
stress strain relationship
critical dynamic stress
resilient module
elastic strain
作者简介
王天亮（1981-），男，河北保定人，博士生．email：07115283@bjtu．edu．cn.
刘建坤（1965-），男，山东临沂人，教授，博士，博士生导师．
