中主应力对原状软粘土强度与变形影响的试验研究  

Research on Influence of Intermediate Principal Stress on Intact Soft Clay's Strength and Deformation

作　　者：王月梅[1] 

机构地区：[1]江西理工大学应用科学学院,江西赣州341000

出　　处：《浙江交通职业技术学院学报》2015年第4期14-20,共7页Journal of Zhejiang Institute of Communications

基　　金：江西省教育厅科学技术研究项目(GJJ14436)

摘　　要：赣南地区软粘土层性状复杂,强度低、孔隙比大、压缩性高、结构性强,而土体的原生各向异性及次生各向异性使影响强度、变形的因素更复杂。借助空心圆柱扭剪仪(HAC)从应力-应变关系的角度研究赣南原生粘土土体不同中主应力参数及主应力轴旋转下的变形规律。试验数据显示原状软粘土土体应变随大主应力轴偏转角增大呈渐增趋势,达到最大值45°后呈渐低趋势;各向应力值未因主应力轴旋转有明显改变,但旋转会产生应变累积;中主应力系数b=0.5时土体原生各向异性在径向应变上有更明显反应。Soft clay in Gannan Prefecture has complex traits such as low shear strength, large void ratio, high compressibility and strong resistance of soil structure while the primary anisotmpy and the secondary anisotropy of soft clay have the more complex affects about strain and deformation. The hollow cylinder apparatus （HAC） is aided to study the clay＇s deformation according as its stress - strain relationship under conditions of changing parameter of intermediate prin- cipal stress and rotating principal stress. It＇s revealed according to experimental data that the strain of intact soft clay is increased while rotating principal stress since the angle of first principal stress turns from 00 to 450 but decreased over 450. Affection from rotation of principal stress is not obvious while clay＇s rotation accumulation arisen and the effect on radial strain is distinct from other strains due to the intact primary anisotmpy as b = 0.5.

关 键 词：中主应力系数 主应力方向 各向异性 主应力轴旋转 原状软粘土 

分 类 号：TU435[建筑科学—岩土工程]