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主要描述了西安地铁二号线车站基坑围护结构桩顶水平位移监测的技术方案,结合基准线法和测小角法测定水平位移,并对实际角度观测进行了误差分析,探讨了地铁围护结构桩顶水平位移监测的观测点坐标对中误差,推导出了采用不同精度的测角仪器观测水平角所需的测回数。
Mainly describes the technical scheme for monitoring the horizontal displacement of pile top of the foundation pit retaining structure in Xi’an Metro Line 2 Station. The horizontal displacement is measured by the baseline method and the small angle method, and the error of actual angle observation is analyzed. The error of the coordinates of the observation points of the horizontal displacement monitoring of pile top is deduced, and the number of measurements required to observe the horizontal angle using different angle measurement instruments is deduced.