过江隧道跨河高程测量方法应用研究  

Application Research on the River-crossing Elevation Measurement Method for Underwater Tunnels

作　　者：姜国华 JIANG Guohua(Geographic Information Engineering Brigade of Jiangxi Geological Bureau,Nanchang 330002,China)

机构地区：[1]江西省地质局地理信息工程大队,江西南昌330002

出　　处：《测绘与空间地理信息》2024年第12期222-224,共3页Geomatics & Spatial Information Technology

摘　　要：针对传统几何水准测量难以进行长距离跨河高程测量问题,本文采用GNSS跨河高程测量进行高程传递,分析GNSS外业测量数据限差,获取水准测点大地高高差并转换为正常高高差。结果表明GNSS跨河高程测量各测回正常高高差互差相对较小,满足规范限差要求。同时,利用全站仪三角高程测量方法对GNSS跨河高程测量成果进行检核,测量结果与GNSS高差观测结果基本一致,高差较差符合允许范围。因此,研究表明,GNSS跨河高程测量和全站仪三角高程对向观测均能够有效解决长距离过江隧道的跨河高程测量问题,观测成果精度较高,满足二等水准测量限差要求,为过江隧道的成功贯通提供了可靠的高程控制基准。Aiming at the problem that it is difficult to carry out long distance river-crossing elevation measurement with traditional geometric leveling survey,this paper adopts GNSS river-crossing elevation survey to carry out elevation transmission,analyzes the tolerance of GNSS field survey data,obtains the geodetic height differences of leveling points,and converts them into orthometric height differences.The results show that the discrepancy between the orthometric height differences measured by GNSS river-crossing elevation survey is relatively small,meeting the specification tolerance requirements.The trigonometric leveling method of total stations was used to verify the results of GNSS river-crossing elevation measurement.The measurement results of trigonometric leveling were basically consistent with the results of GNSS elevation difference observation,and the height difference is within the allowable range.The results show that both GNSS river-crossing elevation measurement and total station reciprocal observation can effectively solve the river-crossing elevation measurement of long-distance underwater tunnels.The observation results have high accuracy,meet the requirements of the tolerance of second-order level measurement,and provide a reliable elevation control datum for the successful completion of river-crossing tunnels.

关 键 词：过江隧道 GNSS跨河高程测量 三角高程测量 对向观测 

分 类 号：P216[天文地球—测绘科学与技术]