应力主轴变化对黄泛区粉质土各向异性特性的影响

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中图分类号：TU441 文献标志码：A 文章编号：2096-6717（2025）03-0001-11

Influence of stress principal axis variation on anisotropic behavior of silty soil in the Yellow River flood area

ZENG Changnv'，MA Yuan1，YIN Hang1，GU Heτ ，WANG Yuke² （1.CollegeofCivilEngineering，Henan UniversityofTechnology，Zhengzhou 450ool，P.R.China；2.Collegeof Water Conservancy and Civil Engineering，Zhengzhou University， Zhengzhou 45Ooo1，P.R.China）

Abstract：Aseries of hollowcylinder torsion shear tests wereconducted for the silty soil in the Yelow River flood area，considering the effect of drainage shearing with major large principal stress direction.The shear stress-strain behavioras wellas the anisotropic characteristics of silty soil were investigated.Under difrent intermediate principal stress coeficients b and major principal stress direction angles α ，the stress-strain relationship and the corrsponding shear stress ratio of silty soil were obtained.It was concluded that the values of α and b have a significant efect on the octahedral stress-strain and the shear stress-major principal strain. The obvious anisotropicic behavior was observed，especially under b=0.5 or1.O.Compressed deformation generally occurred in the major principal strain direction.Under a fixed α ，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 of α=45∘ and b=0.5 ， relevant with to the highest peak shear stress ratio qf/p0 ：

Keywords： silty soil;anisotropy； stress-strain relationship；rotation of principal stressaxis；failure strength

黄泛区大量基础设施分布在粉土地基之上，该地区粉土具有高分散性、低黏结性和弱可塑性的特点，难以压实且水稳性较差，给当地基础设施的修建与维护带来极大困扰。（剩余16176字）