地铁荷载下隧道周围粉性土孔压的单因素试验  

Single factor test of pore water pressure on silty soil around Tunnel under subway loads

作　　者：闫春岭[1] 张书石 李阳阳 YAN Chunling;Zhang Shushi;Li Yangyang(School of Civil and Architectural Engineering,Anyang institute of technology Anyang Henan 455000 China)

机构地区：[1]安阳工学院土木与建筑工程学院

出　　处：《石家庄铁路职业技术学院学报》2019年第2期7-13,共7页Journal of Shijiazhuang Institute of Railway Technology

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资助

摘　　要：为了研究地铁荷载作用下饱和粉性土的孔隙水压力特性,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,考虑了振动频率、动应力幅值及固结比等因素对孔隙水压力的影响。试验结果表明:土体遭受地铁振动荷载作用下,孔隙水压力经过三个阶段的变化过程,即快速增长-缓慢增加-衰减稳定。相同振动频率及固结比条件下,动应力幅值越大,产生的孔隙水压力越大;相同动应力幅值及固结比条件下,频率越小,产生的孔隙水压力越大;相同动应力幅值及振动频率条件下,固结比越大,产生的孔隙水压力越大。采用单因素设计法及方差分析,得到振动频率、动应力幅值及固结比等因素均对孔隙水压力有非常显著的影响。In order to study the characteristics of pore water pressure on saturated silty soil under subway load, GDS cyclic triaxial test was carried out for the soil near the Guoquan Road, Shanghai Metro Line 10.The effects of vibration frequency, dynamic stress amplitude and consolidation ratio on pore water pressure are considered. The experimental results show there are three stages of the process on pore water pressure under subway loads, that is, rapid growth-slow increase-attenuation stability. Under the same of vibration frequency and consolidation ratio, the larger the dynamic stress amplitude, the greater the pore water pressure is;under the same of dynamic stress amplitude and consolidation ratio, the smaller the frequency is, the greater the pore water pressure is;under the same of dynamic stress amplitude and vibration frequency, the larger the consolidation ratio, the greater the pore pressure. By using of the single factor design method and variance analysis, vibration frequency, dynamic stress amplitude and consolidation ratio have all a significant effect on pore water pressure.

关 键 词：地铁荷载 孔隙水压力 单因素分析 粉性土 

分 类 号：TU411.8[建筑科学—岩土工程]