地铁荷载下隧道周围粉性土变形的影响因素
发布时间：2018-11-01 11:42
【摘要】：针对地铁循环荷载作用下饱和粉性土的变形特性,对上海地铁10号线国权路站附近的饱和粉性土进行GDS(Global Digital Systems)循环三轴试验。试验结果表明:动应力幅值和固结比一定,累积塑性应变随振动频率的增大而变小;固结比和振动频率一定时,累积塑性应变随动应力幅值的增大而增大;动应力幅值和振动频率一定时,累积塑性应变随固结比的增大而增大。通过正交表L_8(2~7)进行安排试验,同时借助编码技术对变量进行分析,得到隧道轴向变形的回归方程,并考虑动应力幅值、固结比和振动频率等因素对回归方程显著性和失拟性进行检验。研究结果表明:该方程是可信的,影响地铁隧道轴线变形的主要因素是动应力幅值,其次是频率和固结比。研究成果对地铁隧道设计具有参考价值。
[Abstract]:According to the deformation characteristics of saturated silt under cyclic loading of subway, the saturated silt near Guoquan Road Station of Shanghai Metro Line 10 was tested by GDS (Global Digital Systems) cyclic triaxial test. The experimental results show that the cumulative plastic strain decreases with the increase of the vibration frequency, and the cumulative plastic strain increases with the increase of the amplitude of the dynamic stress when the consolidation ratio and the vibration frequency are constant. When the amplitude of dynamic stress and vibration frequency are constant, the cumulative plastic strain increases with the increase of consolidation ratio. Through orthogonal table L8 (2 / 7) to arrange the experiment, at the same time, with the help of coding technology to analyze the variables, the regression equation of tunnel axial deformation is obtained, and the amplitude of dynamic stress is taken into account. Factors such as consolidation ratio and vibration frequency are used to test the significance and unfitness of the regression equation. The results show that the equation is credible and the main factors affecting the deformation of the subway tunnel axis are the amplitude of dynamic stress followed by the frequency and consolidation ratio. The research results have reference value for subway tunnel design.
【作者单位】： 安阳工学院土木与建筑工程学院;同济大学地下与建筑工程系;
【基金】：河南省科技计划重点攻关资助项目(152102310204,132102310334) 河南省高校2016年重点科研资助项目(16B560001) 大学生科技创新资助项目
【分类号】：U231.1;U452.11
本文编号：2303819
[Abstract]:According to the deformation characteristics of saturated silt under cyclic loading of subway, the saturated silt near Guoquan Road Station of Shanghai Metro Line 10 was tested by GDS (Global Digital Systems) cyclic triaxial test. The experimental results show that the cumulative plastic strain decreases with the increase of the vibration frequency, and the cumulative plastic strain increases with the increase of the amplitude of the dynamic stress when the consolidation ratio and the vibration frequency are constant. When the amplitude of dynamic stress and vibration frequency are constant, the cumulative plastic strain increases with the increase of consolidation ratio. Through orthogonal table L8 (2 / 7) to arrange the experiment, at the same time, with the help of coding technology to analyze the variables, the regression equation of tunnel axial deformation is obtained, and the amplitude of dynamic stress is taken into account. Factors such as consolidation ratio and vibration frequency are used to test the significance and unfitness of the regression equation. The results show that the equation is credible and the main factors affecting the deformation of the subway tunnel axis are the amplitude of dynamic stress followed by the frequency and consolidation ratio. The research results have reference value for subway tunnel design.
【作者单位】： 安阳工学院土木与建筑工程学院;同济大学地下与建筑工程系;
【基金】：河南省科技计划重点攻关资助项目(152102310204,132102310334) 河南省高校2016年重点科研资助项目(16B560001) 大学生科技创新资助项目
【分类号】：U231.1;U452.11
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