初始固结角度对饱和粉质土应变发展的影响  

Effect of initial consolidation inclination on strain development in saturated silty soil

作　　者：FARHAD Jamil 曾长女[1] 马媛 SHARAFAT Ali FARHAD Jamil;ZENG Chang-nü;MA Yuan;SHARAFAT Ali(School of Civil Engineering and Architecture,Henan University of Technology,Zhengzhou,Henan 450001,China;China Shanxi Sijian Group Co.,Ltd.,Taiyuan,Shanxi 030012,China)

机构地区：[1]河南工业大学土木建筑学院,河南郑州450001 [2]山西四建集团有限公司,山西太原030012

出　　处：《岩土力学》2025年第2期527-538,共12页Rock and Soil Mechanics

基　　金：河南省科技联合基金(No.222103810075);河南工业大学创新基金计划(No.2022ZKCJ07)。

摘　　要：通过主应力旋转试验,研究了黄河饱和粉质土在不同初始固结角度ζ条件下的应变发展规律。结果表明,轴向、环向和扭剪应变表现出不同的模式,显示出ζ对粉质土的力学响应影响。特别是在ζ=90°时,轴向应变在第1次加载循环中表现为压缩行为,而环向应变则表现为拉伸行为。不同初始固结角度引起的各向异性在ζ=90°和ζ=60°附近开始显现。不同ζ值的应变波动趋势趋于稳定,其中ζ=90°和ζ=75°表现出相似性;而当ζ=45°时,表现出最大的波动性和应变幅值。除ζ=90°和ζ=60°外,大多数ζ角下的扭剪应变表现出相似性。体积应变突显了固结角度对土体各向异性特征的显著影响。随着初始固结角的增加,滞回曲线向左移动,表现出循环蠕变特性;在ζ=60°时,剪切应变几乎可以忽略。随着循环周期的增加,滞回环收缩,表现出剪切刚度的持续增强并最终稳定。该研究揭示了初始固结角度对饱和粉质土的力学特性的影响。This study investigates the strain development in saturated silty soil from Yellow River under varying initial consolidation inclination angles ζ by principle stress rotation tests.The results indicate that distinct patterns in axial,circumferential and torsional shear strains show the influence of ζ on the mechanical response of silty soil.Notably,the axial strain exhibits compressive behaviour at ζ=90°during the first cycle,while the circumferential strain displays tensile behaviour.Anisotropy initiates at around ζ=90°and ζ=60°for other ζ angles.Different values of ζ exhibit stabilization trends in strain fluctuations,with ζ=90°and ζ=75°showing intriguing similarities.The case of ζ=45°is distinctive,exhibiting the highest fluctuation and strain amplitude.Torsional shear strain similarities are observed among most ζ angles,except for ζ=90°and ζ=60°.Volumetric strain highlights the significant impact of consolidation angle inclination on anisotropic characteristics.As the initial solidification angle increases,the hysteresis curve shifts left,indicating cyclic creep characteristics,with negligible shear strain observed for ζ=60°.As the cycle period increases,the hysteresis loop contracts,indicating continuous strengthening and eventual stabilization of shear stiffness.This comprehensive study provides valuable insights into the complex behaviour of saturated silty soil under rotational stress conditions,highlighting the role of initial consolidation inclination angles in shaping its mechanical response.

关 键 词：空心圆柱扭剪仪 主应力轴旋转 初始固结角度 粉质土 应力路径 

分 类 号：TU411[建筑科学—岩土工程]