两种跨河水准方法在过江隧道中的应用比较研究

Comparative Study of Two Kinds of Cross River Level Surveying Methods in Cross River Tunnel Elevation Control Network

长距离跨河水准测量是工程精密高程测量一大难点和重点,本文从工程实例出发着重阐述GPS跨河水准测量法和测距三角高程法在钱江隧道高程控制网中(二等水准测量)的应用。分析隧道高程控制网精度要求,对GPS跨河水准测量和测距三角高程法进行技术方案设计,按设计要求组织外业生产和数据精度统计分析,计算出合格的跨河高程测量结果,并将两种测量方法计算结果进行比对分析,最后对洞外水准测量误差所引起的高程贯通误差做出估算评定,以期为同类工程项目高程控制测量提供参考。

Long-distance cross-river leveling is a major difficulty and key point for precise elevation surveying in engineering surveys.This article starts with engineering examples and focuses on the application of GPS cross-river leveling method and ranging triangular elevation method in the elevation control network of Qianjiang Tunnel(second-class leveling).The accuracy requirements of the tunnel elevation control network is analyzed and the technical plan for the GPS cross-river leveling and ranging triangular elevation method is designed.The organized field production and statistical analysis of data accuracy are also designed according to the design requirements,and the qualified cross-river elevation surveying results is calculated.Then the results of the two surveying methods are compared and analyzed.Finally,the elevation error caused by the leveling error outside the cave is estimated,hoping to provide reference for the elevation control surveying of similar engineering projects.