基于高精度GPS的盾构隧道下穿河道河床变形监测  

High-accuracy GPS Monitoring of Riverbed Deformation Due to Shield Tunneling

作　　者：郭稳 李鹏飞[1] 鲍艳[1] 张明聚[1] 高阳[2] 王国权 李瑞 段宪锋 GUO Wen;LI Pengfei;BAO Yan;ZHANG Mingju;GAO Yang;WANG Guoquan;LI Rui;DUAN Xianfeng(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing 100124,China;Structural Health Monitoring and Control Institute,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;University of Houston,Houston 77204,U.S.A.;China Rail No.17 Bureau Group Sixth Engineering Co.,Ltd.,Fuzhou 350014,China;China Railway Construction North China Investment Development Co.,Ltd.,Shijiazhuang 050051,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]石家庄铁道大学大型结构健康监测与控制研究所,石家庄050043 [3]休斯顿大学,休斯顿77204 [4]中铁十七局集团第六工程有限公司,福州350014 [5]中国铁建华北投资发展有限公司,石家庄050051

出　　处：《北京工业大学学报》2020年第5期490-499,共10页Journal of Beijing University of Technology

基　　金：海外及港澳学者合作研究基金资助项目(5182801,51528801)。

摘　　要：为了解决盾构隧道下穿河流施工过程中河床变形难以采用水准仪、全站仪等传统方法监测的问题,作者以石家庄地铁1号线双线盾构隧道下穿滹沱河工程为例,介绍了高精度全球定位系统(global positioning system,GPS)静态观测方法在河床变形长期监测中的应用.首先,布置目标区域监测网,包括1台参考站和6台监测站;然后,对基准站稳定性进行评估,并解算各监测站位移时间序列;最后,根据监测站位移时间序列分析盾构施工影响下河床的变形规律.观测结果表明,该监测方法精度可达到亚毫米级,河床沉降开始于掌子面到达前3~4D(隧道外径),盾尾脱出时沉降速率达到最大值,后行线对地表横向水平位移的影响比先行线的影响大.In general,the deformation of riverbed is difficult to be measured by conventional deformation measuring techniques,such as level gauges and total stations.The application of high-accuracy global positioning system(GPS)in the long-term monitoring of riverbed deformation was introduced by taking the shield tunneling under the Hutuo River in Shijiazhuang as an example in this paper.The method has the flexibility of estimating the average deformation(relative displacements)during different time spans.The 24-hour deformation measurements can achieve sub-millimeter accuracy,and the 1-hour deformation measurements can achieve a few millimeter accuracy.According to the GPS observation,the 24-hour deformation measurements can achieve sub-millimeter accuracy.Settlement started at about 3 to 4D(outer diameter of tunnel)before the shield workface was reached.The settlement rate reached its maximum during the departure of shield tail.The influence of the later excavated tunnel on the lateral horizontal displacement of the riverbed was greater than that of the previous constructed tunnel.The GPS monitoring method described in this paper can be used for long-term monitoring of ground deformation caused by underground engineering construction and operation.

关 键 词：盾构 穿河隧道 河床变形监测 高精度全球定位系统 季节性变形模型 稳定参考框架 

分 类 号：TU196.1[建筑科学—建筑理论] TU91