高寒地区高铁长大隧道洞内控制测量

Control survey inside long tunnel of high-speed railway in cold region

高寒地区隧道内外温差大,在冬季尤为明显,气温对导线网距离观测值影响显著,自由测站边角交会网的边长相对常规导线网较短,可降低温差对距离的影响。本文综合分析了新版《铁路工程测量规范》对普速铁路无砟轨道隧道洞内CPⅡ自由测站边角交会网和洞内导线测量的技术要求,结合高寒地区高速铁路隧道工程建设洞内控制测量的实际需求,研究提出了使用CPⅡ自由测站边角交会网测量方法进行洞内控制测量的主要技术要求的建议。应用项目CPⅡ网满足建议的技术要求后,利用该CPⅡ网起算的CPⅢ网平差成果精度能满足现行《高速铁路工程测量规范》中CPⅢ点位中误差小于2mm等相关技术指标要求,测量成果表明自由测站边角交会网适用于高寒地区高铁长大隧道的洞内控制测量。

The temperature difference between the inside and outside of the tunnel is large in the cold region, especially in winter. The temperature has a significant influence on the observation value of the traverse network. The length of the side-angle resection at freely-occupied station network is relatively short, which can reduce the influence of the temperature difference on the distance. The technical requirements of CPⅡ side-angle resection at freely-occupied station network and traverse measurement for general-speed railway tunnels with ballastless tracks in the new version of Code for railway engineering survey have been analyzed comprehensively in this article. Based on actual demands of control surveying for high-speed railway tunnels in cold region, the suggestions on the main technical requirements for the measurement of control survey inside tunnels have been discussed. After the CPⅡ network of the tunnel meets the recommended technical requirements, the accuracy of the CPⅢ network adjustment results initialized from the CPⅡ points can meet the requirements in the current Code for engineering survey of high speed railway, such as the position error of CPⅢ points is less than 2 mm, etc. The results of the measurement have shown that the side-angle resection at freely-occupied station network is suitable for control survey inside long tunnel of high-speed railway in cold region.