摘要
为探究黄泛区粉质土在复杂应力状态下的各向异性特征,利用GDS空心圆柱系统开展排水条件下固定大主应力方向的剪切试验,获得黄泛区粉质土在不同中主应力系数b和大主应力方向角α下的应力-应变关系和剪应力比关系,研究其各向异性特征。结果表明:黄泛区粉质土八面体应力-应变、剪应力-大主应变受大主应力方向角α和中主应力系数b的影响作用较大;粉质土表现出较强的各向异性特征,尤其在b=0.5和1.0时更为明显;试样的大主应变沿着α角发展为压缩状态,当α固定时,b值越大,试样对应的峰值剪应力较小,试样在b=0.5且α=45°时的峰值剪应力q和对应的ε_(1)最大,相对于其他b值条件,当试样的b值固定在0、α固定在45°时,试样的平均峰值强度更大,这个规律对于α角也适用,且b=0.5、α=45°时的峰值剪应力比q_(f)/p_(0)最大。
A series of hollow cylinder torsion shear tests were conducted for the silty soil in the Yellow River flood area,considering the effect of drainage shearing with major large principal stress direction.The shear stress-strain behavior as well as the anisotropic characteristics of silty soil were investigated.Under different intermediate principal stress coefficients b and major principal stress direction anglesα,the stress-strain relationship and the corresponding shear stress ratio of silty soil were obtained.It was concluded that the values ofαand b have a significant effect on the octahedral stress-strain and the shear stress-major principal strain.The obvious anisotropicic behavior was observed,especially under b=0.5 or 1.0.Compressed deformation generally occurred in the major principal strain direction.Under a fixedα,the smaller shear strength occurred under a larger b value.The peak shear strength and the corresponding axial strain were the greatest under the conditions ofα=45°and b=0.5,relevant with to the highest peak shear stress ratio q_(f)/p_(0).
作者
曾长女
马媛
尹航
谷贺
王钰轲
ZENG Changnv;MA Yuan;YIN Hang;GU He;WANG Yuke(College of Civil Engineering,Henan University of Technology,Zhengzhou 450001,P.R.China;College of Water Conservancy and Civil Engineering,Zhengzhou University,Zhengzhou 450001,P.R.China)
出处
《土木与环境工程学报(中英文)》
北大核心
2025年第3期1-11,共11页
Journal of Civil and Environmental Engineering
基金
国家自然科学基金(52109140)
河南省科技攻关项目(212102110027)
河南省科技研发计划联合基金项目(222103810075)。
关键词
粉质土
各向异性
应力-应变关系
主应力轴旋转
破坏强度
silty soil
anisotropy
stress-strain relationship
rotation of principal stress axis
failure strength
