摘要
以粉质黏土重塑土经等压固结形成的试样为试验对象,研究了在小应变范围内深基坑开挖应力路径对土体剪切模量的影响以及剪切模量随应变变化的趋势.研究表明,在小应变范围内,剪切模量的初始值与有效球应力之间存在着幂函数关系,但主动区内幂函数的理论值与试验值间的符合度要比被动区内的高;剪切应变处于0.01%~1%内表现出很强的非线性,同时具有很高的剪切模量;在同一应变水平下,不同应力路径,剪切模量的数值不同,但剪切模量随剪切应变增加而衰减的规律一致;剪切应变为0.01%时的剪切模量与剪切应变为1%时的剪切模量之间存在着量级差别.
The trial object is reconstituted soil after isotropic consolidated.The effect of stress path of deep excavation on shear moduli and the trend of shear moduli along with shear strain on the condition of small strain were studied.Some conclusions were drawn.On the condition of small strain,there is a power function relationship between the initial value of shear moduli and effective normal stress,but the match degree between the theory value gained by power function relationship and the testing value in active area is higher than that in passive area.During the range of shear strain between 0.01% and 1%,the relationship between the stress and strain is of high non-linear,and shear moduli is much bigger.Under the same strain level and different stress path,the value of shear moduli is different,but the rule of moduli attenuation along with shear strain increment is identical.There is magnitude distinction of shear moduli between shear strain lever 0.01% and 1%.
出处
《交通科学与工程》
2010年第2期16-20,共5页
Journal of Transport Science and Engineering
基金
中国博士后基金项目(20090461257)
山东科技大学春蕾计划项目(2009AZZ180)
关键词
等向固结
小应变
剪切模量
深基坑
应力路径
isotropic consolidated
small strain
shear moduli
deep excavation
stress path
