摘要
以标准砂为试样,利用GDS数字控制应力路径三轴仪进行了K0初始应力条件下8条特殊应力路径试验。在小应变区域内,通过刻画在应力空间的等应变应力线的变化规律,推导了可以考虑任意应力路径和应力路径方向变化的杨氏模量计算方法,并对泊松比进行了研究,建立了砂土在小应变区域内可以考虑复杂应力条件的本构模型。模型可以反映小应变时砂土的高模量、非线性以及模量急剧变化等主要特征;也可以模拟一般模型所不能考虑的应力路径方向变化引起的模量变化。
By using the digital stress path controlled trixial apparatus, eight tests were conducted on standard sands under special stress paths starting from an initial K0 stress condition. At small strains, the variation of the stress line of equal strain was depicted. A formula of the Young＇s modulus along an arbitrary stress path and its direction was derived. Besides, the poison＇s ratio was also studied. On this basis, a constitutive model of sands that could consider the effect of complex stress condition was established. This model was capable of reflecting the major behavior of sand at small strain, such as non-linearity, high stiffness and drastic change with strain. It could also simulate the variation of stiffness induced by stress paths direction that was not considered in the common models.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2006年第6期745-749,共5页
Chinese Journal of Geotechnical Engineering
关键词
砂土
小应变
应力路径
本构模型
杨氏模量
泊松比
sands
small strain
stress path
constitutive model
Young＇s modulus
Poisson＇s ratio
