列车荷载作用下压实花岗岩残积土累积变形特性试验研究  

Research on cumulative plastic strain characteristics of graniteresidual soil under cyclic loading

作　　者：尹松[1,2] 刘鹏飞 孙玉周[2] 李新明[2] 闫盼 王志留 YIN Song;LIU Pengfei;SUN Yuzhou;LI Xinming;YAN Pan;WANG Zhiliu(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;School of Civil Engineering and Architecture,Zhongyuan University of Technology,Zhengzhou 450007,China)

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071 [2]中原工学院建筑工程学院,郑州450007

出　　处：《振动与冲击》2024年第4期87-95,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(51709290);岩土力学与工程国家重点实验室开放基金项目(Z019020);河南省高等学校青年骨干教师培养计划(2020GGJS136;2019GGJS142);河南省高等学校重点科研项目计划基础研究专项(20ZX009);中原工学院优势学科实力提升计划资助项目(GG202218)。

摘　　要：为研究列车荷载作用下应力及湿化条件对压实花岗岩残积土累积变形特性的影响,以围压、动应力幅值、含水率为变量,对压实花岗岩残积土进行循环空心扭剪和循环定向加载试验。结果表明:循环扭剪应力路径下主应力轴旋转效应增加了试样的累积变形量,甚至改变了累积变形的发展模式,该影响程度随试样含水率的增大而增大;试样的累积应变发展速率在加载初期(N<100)时完成大幅度衰减,围压增大可加快累积应变发展速率的衰减,动应力幅值的增加会延长累积应变发展速率的衰减时间,循环扭剪加载时试样的累积应变发展速率衰减程度小于循环定向加载试验,含水率越高该效应越显著。通过预测模型能够对两种动力加载应力路径下的稳定型和发展型累积应变发展曲线能够进行拟合,对压实花岗岩残积土的累积变形作出较好预测。In order to study the influence of stress and humidification conditions on the cumulative deformation characteristics of compacted granite residual soil under train load,cyclic hollow torsional shear and cyclic directional loading tests were carried out on compacted granite residual soil with confining pressure,dynamic stress amplitude and water content as variables.Results show that the rotation effect of principal stress axis under cyclic torsional shear stress path increases the cumulative deformation and even changes the development mode of the cumulative deformation,and the effect degree increases with the water content of the sample.Sample rate of accumulated strain development at the beginning of the load(N<100)complete greatly attenuation,the increase of confining pressure can accelerate the development of accumulated strain velocity attenuation,the increase of the dynamic stress amplitude will extend the accumulated strain development rate decay time,cumulative strain development of cyclic torsional shear loading when the sample rate attenuation degree directional load is less than the cyclic triaxial test,The higher the moisture content,the more significant the effect.The prediction model can fit the development curves of stable and developed cumulative deformation.

关 键 词：花岗岩残积土 循环加载 空心圆柱剪切仪 应力路径 主应力轴旋转 累积变形预测 

分 类 号：TU4[建筑科学—土工工程]