深圳大学学报（理工版）
深圳大學學報（理工版）
심수대학학보（리공판）
JOURNAL OF SHENZHEN UNIVERSITY (SCIENCE & ENGINEERING)
2009年
4期
400-404
,共5页
卸载土体%饱和淤泥质软土%基坑开挖%回弹模量%压缩模量
卸載土體%飽和淤泥質軟土%基坑開挖%迴彈模量%壓縮模量
사재토체%포화어니질연토%기갱개알%회탄모량%압축모량
unloading soil%saturated muddy clay%foundation excavation%rebound modulus%compressive modulus
利用常规压缩仪对上海饱和淤泥质软土进行一维分级卸载实验,得到淤泥质黏土在卸载作用下的应力应变关系,及回弹变形与回弹模量的时效性规律.试验结果表明,回弹变形与卸载比近似呈线性关系;土样在卸载瞬间,回弹速率最大,其后随时间迅速衰减;回弹模量随时间近似呈指数衰减,可用指数方程进行归一化拟合;卸载后的回弹模量远大于压缩模量,其最小比值介于2～7之间.
利用常規壓縮儀對上海飽和淤泥質軟土進行一維分級卸載實驗,得到淤泥質黏土在卸載作用下的應力應變關繫,及迴彈變形與迴彈模量的時效性規律.試驗結果錶明,迴彈變形與卸載比近似呈線性關繫;土樣在卸載瞬間,迴彈速率最大,其後隨時間迅速衰減;迴彈模量隨時間近似呈指數衰減,可用指數方程進行歸一化擬閤;卸載後的迴彈模量遠大于壓縮模量,其最小比值介于2～7之間.
이용상규압축의대상해포화어니질연토진행일유분급사재실험,득도어니질점토재사재작용하적응력응변관계,급회탄변형여회탄모량적시효성규률.시험결과표명,회탄변형여사재비근사정선성관계;토양재사재순간,회탄속솔최대,기후수시간신속쇠감;회탄모량수시간근사정지수쇠감,가용지수방정진행귀일화의합;사재후적회탄모량원대우압축모량,기최소비치개우2～7지간.
One-dimensional unloading tests were carried out on saturated muddy clay samples from Shanghai by means of routine compressometer. Stress-strain relationship and time-dependency properties of rebound deformation and rebound modulus of muddy clay samples were obtained. The results show that rebound deformation is approximately linear related to unload ratio. Rebound speed reaches the maximum when soil sample is unloaded, and then it decreases quickly with time. The change of rebound modulus with time is normalized to fit with an exponential equation. Rebound modulus much greater than compressive modulus, and the retios under differcst unloading are of the range between 2 and 7.
