摘要
为研究砂土在不同初始应力下主应力轴旋转的变形规律,使用空心圆柱扭剪仪,在不同初始固结比下对饱和砂土进行了一系列的主应力轴旋转定向剪切试验,分析了孔隙水压力的变化情况,并结合有效应力路径对砂土的变形特性进行了分析,同时对试样破坏标准进行了试验验证。结果表明:砂土初始固结比越大,在主应力轴旋转的情况下越容易出现剪胀,固结比与主应力轴角度存在耦合关系,且试样剪切峰值强度随固结比的增加而增大,剪切应力—广义剪应变关系均表现为硬化特征,并在广义剪应变达到8%时,可认定试样已达到破坏状态。
In order to study the deformation law of sand under different initial stresses under the rotation of the principal stress axis,a series of directional shear tests about saturated sand under the different initial consolida-tion ratios were carried by using the hollow cylinder apparatus.The deformation characteristics of sand were ana-lyzed by combining the changes in pore water pressure with effective force paths,and the failure criteria of the samples were experimentally verified.The research results showed that the larger the initial consolidation ratio of sand,the more likely it is to experience shear dilation under the rotation of the principal stress axis.There is a coupling relationship between the angle of principal stress axis and the consolidation ratio,and the peak shear strength of the samples increases with the increase of consolidation ratio.The Shear stress generalized shear strain relationship shows hardening characteristics,when it reaches 8%,it can be considered that the sample has reached a state of failure.
作者
黎盟
LI Meng(China Railway 15th Bureau Group Co.,Ltd.,Luoyang 471901,China)
出处
《青海交通科技》
2025年第1期39-43,共5页
Qinghai Transportation Science and Technology
关键词
饱和砂土
固结比
主应力轴旋转
砂土变形
剪胀剪缩
saturated sand
consolidation ratios
principal stress axis rotation
deformation characteristics
shear dilation and contraction
