高速铁路隧道洞内CPII平面网建网测量新方法研究

摘要

基于导线环网的传统高速铁路隧道洞内CPII平面网建网方法存在控制点标志易被破坏，观测时受隧道侧壁旁折光影响严重和点位精度不均匀等缺点。为了克服这些缺点，文中提出一种基于自由测站边角交会网的高铁隧道洞内CPII平面网建网新方法。理论和实践证明，新方法不仅能有效克服传统方法的不足，而且在提高测量效率和测量精度方面有着显著优势，值得推广使用。%The traditional method ,based on cyclical traverse network ,for building in‐tunnel horizontal control network of CPII in high‐speed railway has some shortcomings like physical symbols of control points are easy to be destroyed .The observation accuracy is affected seriously by lateral refraction from the wall of tunnel when observing ,and positional accuracy is inhomogeneous .In order to overcome those shortcomings ,research group proposes a new method based on a free‐station linear‐angular intersection network .Studies show that the new method not only can overcome the shortcomings of traditional method , but also improve the measurement efficiency and accuracy ,so it is worth spreading .