测量网形对特长隧道贯通误差的影响

Influence of the type of survey control network on the through error in extra-long tunnel

控制测量精度直接影响隧道工程建设质量,是决定隧道工程能否精确贯通的关键因素。控制测量精度受多种因素影响,其中测量网形则是其精度影响的关键因素之一。以某特长铁路隧道工程为例,根据现阶段隧道工程测量技术与经验,分别设计若干种洞内、外控制测量网形方案,采用数据模拟的方法,分别计算各方案的隧道横向贯通误差影响值,结合实际工作量与隧道工程贯通限差要求,分析各控制网在特长隧道工程控制测量中的应用情况,为特长隧道控制测量工作的开展提供参考。

The accuracy of control network directly affects the construction quality of tunnel engineering,and is the key factor to determine whether the tunnel engineering can be connected accurately.The accuracy of control measurement is affected by many factors,among which the selection of network type is one of the key factors.According to the current construction technology and experience of tunnel engineering,several control network schemes were designed for the above ground and underground control survey of an extra-long tunnel project,and the lateral link-up error of each scheme was calculated by data simulation method.Combined with the actual workload and the limit of through error of tunnel engineering,analyzed the application of each control network scheme in the control survey of extra-long tunnel engineering,so as to provide reference for the development of extra-long tunnel control survey.