超长隧道洞内小曲线控制网测量新方法的应用

隧道控制测量的主要目的是控制横向贯通误差,保证隧道准确贯通。高速铁路线路控制网(CPⅡ)是轨道控制网(CPⅢ)平面网的上一级控制网。因此,CPⅡ控制网的精度直接影响CPⅢ平面网的精度,从而对隧道贯通起着决定性作用。长距离小曲线隧道洞内CPⅡ平面控制测量易受视线限制,针对上述问题,本文提出一种在小曲线段的测量新方法,并对布网方案、测量方法、精度控制及平差计算进行研究和分析。经过工程验证,该方法能够满足隧道二等的精度要求。

Application of New Method for Measurement of Small CurveControl Network in Ultra-long Tunnel

The main purpose of tunneling control measurement is to control transverse penetration error and ensure accurate tunneling.High speed railway line control network(CPⅡ)is orbit control network(CPⅢ)flat network control network at the next higher level.As a result,the accuracy of the CPⅡ control directly affects the precision of the CPⅢ flat network author,to tunnel through plays a decisive role.Long small curve tunnel in CPⅡ hole plane control survey line of sight restrictions.Based on the practical engineering experience,this paper proposes a measurement method for the small curve segment,and designs and studies the network construction scheme,measurement method,precision control and adjustment calculation.The method has been verified by engineering,and the measurement results can meet the second-class precision requirements of the tunnel.