Abstract
When metro shield passes through existing operating lines, it is necessary to carry out automatic monitoring of existing lines. In this paper, taking the construction of Changsha Metro Line 4 under the shield of the existing Metro Line 2 as an example, the static level is set up in the construction affected area to monitor the vertical displacement of the track bed automatically. According to the actual situation of the site, a complete set of automatic monitoring system is designed, and a detailed site implementation scheme is formulated. Finally, the deformation data is analysed, and the characteristics of the whole system are summarized.
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