地铁荷载下隧道周围粉性土变形的2~2因子设计  

2~2 Factorial Design for Deformation of Silty Soil around Tunnel under Subway Loading

作　　者：闫春岭[1,2] 张书石 李阳阳 孔豫栋 YAN Chunling;ZHANG Shushi;LI Yangyang;KONG Yudong(School of Civil and Architectural Engineering,Anyang Institute of Technology,Anyang 455000,Henan,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]安阳工学院土木与建筑工程学院,河南安阳455000 [2]同济大学地下与建筑工程系,上海200092

出　　处：《地震工程学报》2018年第5期1012-1017,共6页China Earthquake Engineering Journal

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年重点科研项目(16B560001);大学生科技创新项目

摘　　要：为研究地铁荷载作用下饱和粉性土的累积塑性变形特性,针对上海地铁10号线国权路附近的饱和粉性土进行多功能GDS循环三轴试验,考虑振动频率、动应力幅值对累积塑性应变的影响。试验结果表明:相同振动频率下,动应力幅值越大产生的累积塑性应变就越大;相同动应力幅值条件下,频率越小产生的累积塑性应变就越大。采用2~2因子设计法进行分析,得到振动频率、动应力幅值及振动频率与动应力幅值互作等因素均对累积塑性应变有显著影响。通过回归分析理论,建立考虑振动频率、动应力幅值及振动频率与动应力幅值互作等因素的累积塑性应变的非线性方程,并对方程进行检验。该研究成果能为控制地铁运营产生的沉降提供有价值的理论依据。To study the cumulative plastic deformation characteristics of saturated silty soil under subway loads,the GDS cyclic triaxial testing system was used to test the saturated silty soil near the Guoquan Road,Shanghai Metro Line 10.The effects of vibration frequency and dynamic stress amplitude on the cumulative plastic strain were considered.The experimental results show that the cumulative plastic strain increases with the dynamic stress amplitude,and with the same dynamic stress amplitude,the cumulative plastic strain increases as the frequency decreases.By an analysis with the 2^2 factorial design method,it was found that the vibration frequency,the dynamic stress amplitude,and the interaction between the two have a significant effect on the cumulative plastic strain.Based on the theory of regression analysis,the nonlinear equation of cumulative plastic strain was established,which considers the vibration frequency,the dynamic stress amplitude,and the interaction between the two,and the equation was tested.The research results can provide a valuable theoretical basis for controlling the subsidence induced by subway operation.

关 键 词：地铁荷载 因子设计 变形特性 粉性土 

分 类 号：TU411.8[建筑科学—岩土工程]