地铁运营阶段隧道水平位移测量实施优化探究

地铁隧道结构稳定与地铁运营安全及舒适性紧密相关,地铁运营阶段的变形监测是确保结构稳定的重要措施。为探究地铁隧道基准点布置复杂情况,如点位破坏、集中布点与基准点距离变化等因素对水平位移监测精度影响,依托南京地铁某保护区的地铁变形监测数据,试算并讨论基准点数量、位置分布等因素与设站点精度间的对应关系,得出基准点数量与仪器测角精度是影响设站点精度的重要因素,并根据定量分析结果,给出地铁水平位移监测在满足精度要求条件下更加优化的实施建议。

Research on Optimized Surveying of Horizontal Displacement in Subway Tunnel during Metro Operation Phase

The safety and comfort of the subway are closely related to the stability of tunnel structure,and the deformation monitoring during operation phase is crucial to the stability of the structure. To understand the relationship between the accuracy of the horizontal displacement and the change of the observation elements,the influence of the accuracy of the set point,the change of the number of the control point,the diversity of the observation elements of side-angle resection are analyzed based on the deformation monitoring data of the tunnel in the protected area of Nanjing Metro. The results of the quantitative analysis show that the number of the control point is an important factor to the accuracy of the set point,and the accuracy of the set point and the observation elements are correlated. Thus,the more optimized surveying is recommended under the condition that the accuracy of horizontal displacement monitoring meets the requirements.