现场对隧道周边位移收敛值、拱顶下沉值和地表下沉值进行监测。
Furthermore, peripheral displacement convergence and settlement of vault and ground surface are monitored on-site.
并以其中电子经纬仪虚拟照片法观测隧道周边位移为例，分析了系统的原理、使用方法及其精度。
Using electron theodolite dummy photograph observing tunnel border displacement, as the example, the authors analyse the principle, means and precision of the system.
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