附加对向观测约束的多测站自动化基准网组网方法研究

Research on the Networking Method of Multi-station Automation Reference Network with Additional Direction Observation Constraint

随着城市经济化与现代化水平的提升,交通压力越来越大,地铁成为缓解城市交通压力的重要手段。伴随轨道交通网的发展,临近地铁的施工,对既有地铁结构会产生一定的变形扰动。因此,有必要对受施工扰动的地铁结构开展自动化监测。地铁自动化监测项目中,单个测站构网无法满足监测范围广项目需求,需通过多个测站串联观测,构建基准网。为此,分析自动化监测项目中常用的基于自由设站边角交会的组网方法及其不足,提出基于附加对向观测约束的多测站组网方法,并以福州地铁5号线某地保监测项目为例,验证了该基准网构建方法的精度可靠性及网型稳健性。

With the improvement of urban economic and modernization levels,traffic pressure is increasing.The subway has become an important means to relieve urban traffic pressure.With the development of the rail transit network,the construction near the subway will cause certain deformation disturbances to the existing subway structure.Therefore,it is necessary to carry out automatic monitoring of the subway structure disturbed by construction.In subway automatic monitoring projects,a single measuring station network cannot meet the project requirements of a wide monitoring range.It is necessary to conduct series observations of multiple measuring stations to construct a reference network.For this reason,the networking method based on free station setting and side-angle intersection commonly used in automatic monitoring projects and its deficiencies are analyzed.A multi-station networking method based on additional opposite observation constraints is proposed.Taking a local protection monitoring project of Fuzhou Metro Line 5 as an example,the accuracy reliability and network robustness of this reference network construction method are verified.