建立莲花山隧道工程的GPS三维控制网

GPS in Application to Build 3-D Control Network of Lianhuashan Tunnel Engineerring

介绍了在广东莲花山隧道工程中应用GPS技术建立三维控制网的工作实践。从隧道工程本身的特点出发 ,分别就平面和高程控制阐述了GPS网的布设方式和数据后处理的特色 ,包括附加参数拟合法统一高程系统、采用“施工椭球”的高斯投影法坐标转换和适合隧道控制测量的GPS后处理软件包等。竣工实测的莲花山隧道工程的平面和高程贯通误差均远远小于有关隧道施工测量的技术指标。

A practice GPS application to build 3-dimensional control natwork of Guangdong Lianhuashan tunnel engineering is introduced in this paper.Based on the feature of tunnel engineering construction,the configuration of GPS network and the trait in processing of GPS data are separately expounded on horizontal and vertical control network.The fitting methods of additional parameter to build tunnel construction vertical datum,the datum transformation of using'Construction Ellipsoid'as reference of Gauss-Kruger projection and the software for processing of GPS data in tunnel construction surveying are separately presented.The practical results in horizontal and vertical errors of piercing of Lianhuashan tunnel engineering are far less than the allowable values of tunnel construction surveying.