摘要
海南东环铁路美兰机场明挖隧道基坑,采用锚索与钢支撑混合支撑的方案。给出了基坑围护和变形监测方案,对该基坑施工跟踪监测,掌握支撑内力、基坑变形的变化动态,分析了施工过程中支护结构位移与内力的变化特征,测试表明:①锚索轴力在基坑开挖时变化较大,基坑开挖完成后逐渐趋于稳定;②钢支撑架设后,监测到的轴力有不断增加的趋势,监测值有小的跳动,但最终趋于稳定;③桩体水平位移随基坑的深度逐渐减小,在基坑顶部位移最大,基坑底部位移趋于零。
Tunnel foundation-pit through Meilan Airfield in Hainan,which is open cut,adopts the mixed-support structure of anchor rope and steel support.The project of preserving the foundation pit and monitoring distortion is given.The process of construction is monitored.The dynamic change of the internal force and distortion is controlled.The features of shifting and force change in the support structure are studied during construction.The results show that ① the axial force of anchor rope changes a lot at the beginning of construction,but gets gentle later;② after building the steel support,the axial force has a tendency of growing uninterruptedly and the result has little change and gets gentle finally;③ the horizontal displacement of pile body gets small with the increase of the depth of foundation pit and is the largest at the top and zero at the bottom.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2010年第S1期483-488,共6页
Chinese Journal of Geotechnical Engineering
关键词
深基坑
混合支撑
锚索
监测
deep foundation pit
mixed support
anchor rope
monitoring
