沉管隧道加测陀螺边的地下导线贯通误差预计模拟法研究

Research on break-through error simulated estimation of underground traverse with gyro observation in an immersed tunnel

针对传统加测陀螺边的地下导线贯通误差预计的解析法没有考虑随机误差的相互抵偿性,使预计结果偏于保守的问题,基于蒙特卡洛模拟方法,顾及陀螺定向测量的观测方式和误差分布规律,提出一种利用模拟观测值代替陀螺观测值进行贯通误差预计的方法,并以港珠澳大桥沉管隧道1∶1实景模拟试验验证该方法的可行性与可靠性。结果显示,该模拟方法能够有效预计贯通误差,对加测陀螺边的地下导线网型有良好的应用效果,可以为优化地下导线控制网提供参考。

The mutual compensation of random errors is often neglected in traditional analytical method of break-through error estimation for underground traverse with gyro observation,and it leads to an overestimation of the error. Based on Monte Carlo random simulation technology,a break-through error estimation method is proposed. The method is tested on an equivalent mock-up network of the tunnels associated with the Hong Kong-Zhuhai-Macao Bridge. The results prove that the proposed method could effectively estimate break-through error,and has a good application effect for underground traverse with gyro observation.