特长隧道洞外GPS平面控制测量数据处理模式与方法研究

隧道洞外GPS控制网作为洞内控制测量和后续施工放样的起算基准,其数据处理模式与方法在确保隧道工程质量上至关重要。针对特长隧道洞外GPS平面控制测量数据处理环节所存在的一些问题,对特长隧道洞外GPS平面控制测量数据处理模式与方法进行研究,在此基础上对基线解算软件选择、基线解算和网平差处置策略、投影变形控制方法、一点一方向建立隧道坐标系、横向贯通误差计算以及框架基准统一与转换等方面提出一些原则和方法,总结归纳并形成一套完整的长大隧道洞外GPS平面控制测量数据处理体系,不仅提高了基线解算与网平差的可靠性和精度,也解决了隧道洞外GPS控制网框架基准的统一问题,该研究可为类似大型线状工程的GPS控制测量数据处理提供借鉴。

Research on Data Processing Mode and Method of GPS Horizontal Control Surveying outside Extra-long Tunnel

The GPS control network outside the tunnel serves as the initial calculation datum for the control survey inside the tunnel and the subsequent construction layout, and its data processing mode and method are critical in ensuring the quality of tunnel engineering. Due to the fact that there are a series of problems in the measurement data processing of the GPS horizontal control surveying outside the extra-long tunnel, researches on data processing mode and method of the GPS horizontal control surveying outside the extra long tunnel are conducted. On this basis, some principles and methods are proposed for the selection of baseline solution software, baseline solution and network adjustment strategy, projection deformation control method, establishment of tunnel coordinate system of one point and one direction, lateral link-up error calculation and frame benchmarking and transformation. The formation of a complete measurement system for GPS control network outside the extra-long tunnel can not only improve the reliability and accuracy of the baseline solution and network adjustment, but also solve the problem of frame datum uniformity of the GPS control network outside the tunnel. This study may provide some references for GPS measurement data processing of other similar large linear projects.