An integrated monitoring method for internal and external deformation of a rock-fill dam, the method comprising: on the basis of a pipeline measurement robot, performing collection in a compression-resistant flexible pipeline, so as to obtain internal deformation data of a rock-fill dam; on the basis of a Beidou/GNSS monitoring system, performing collection on a monitoring point, so as to obtain external deformation data of the rock-fill dam; and performing post-processing so as to obtain an internal deformation monitoring index and an external deformation monitoring index, performing analysis in combination with the internal deformation monitoring index and the external deformation monitoring index, so as to obtain an overall deformation curve, and performing early warning according to curve analysis and a set threshold value. A unified geographic reference coordinate system is utilized for internal deformation data of a rock-fill dam and external deformation monitoring data, which is observed in real time over the long term, of the dam, so as to realize integrated monitoring of the internal and external deformation of the rock-fill dam.
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