地铁荷载下隧道周围粉性土变形的影响因素  

Influencing factors of the deformation on the silty soil around the tunnel under subway loading

作　　者：闫春岭[1,2] 侯晓兵[1] 陈敦广 张娇磊 YAN Chunling;HOU Xiaobing;CHEN Dunguang;ZHANG Jiaolei(School of Civil and Architectural Engineering, Anyang Institute of Technology, Anyang 455000, 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：《铁道科学与工程学报》2017年第9期1942-1950,共9页Journal of Railway Science and Engineering

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

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。For the deformation characteristics of saturated silty soil under subway loading,GDS(Global DigitalSystems)cyclic triaxial test was carried out on silty soil from Metro Line10around Guo Quan road station inShanghai.The results showed that cumulative plastic strain became smaller with the increasing of the vibrationfrequency when the dynamic stress amplitude and consolidation ratio was constant.Similarly,the cumulativeplastic strain also heightened with the increasing of the consolidation ratio when dynamic stress amplitude andvibration frequency were constant.The regression equation on tunnels axial deformation and influencing factorswas gained by L8(27)orthogonal test with the use of coding techniques,and axial deformation model waseventually obtained.By the significance and fit tests,the regression equation was credible.The results showedthat the order of the importance of each factor affecting the subway tunnels axis deformation was the dynamicstress amplitude,the frequency,and the consolidation ratio.This research has important reference value to thesubway tunnel design.

关 键 词：地铁荷载 变形特性 土动力试验 粉性土 

分 类 号：TU411.8[建筑科学—岩土工程]