4.7 Article

Application of a multi-smartphone measurement system in slope model tests

Journal

ENGINEERING GEOLOGY
Volume 295, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.enggeo.2021.106424

Keywords

Physical modelling; Slope model; Slope deformation; Smartphone; Photogrammetry

Funding

  1. National Major Scientific Instruments and Equipment Development Projects of China [41827808]
  2. National Key Research and Development Program of China [2017YFC1501305]

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The study introduced a multi-smartphone measurement system for measuring the 3D surface deformation of slope models, which showed high accuracy in both static and dynamic models. Processed by postprocessing software, the system demonstrated potential as a popular method for measuring slope models.
Physical model tests are considered to be useful tools and are widely used in landslide research. The three-dimensional (3D) surface deformation of slope models provides useful information for investigating the behaviour and mechanism of landslides. In this study, a measurement system called a multi-smartphone measurement (MSM) system was proposed and developed to measure the 3D surface deformation of slope models. This system includes nine identical smartphones, a USB hub, a control software package, and some postprocessing software. A series of high-quality images were simultaneously captured through the hardware devices and subsequently processed by using postprocessing software including 3D reconstruction and particle image velocimetry. A comparison with the results of a laser scanner was performed, and the performance of the MSM system was tested in two static models and one dynamic slope model. The system's accuracy was assessed using the root mean square error (RMSE) of the cloud-to-cloud distance. The results show that the accuracy of the MSM system for both the static and dynamic models is less than 1.1 mm. A short-period, low-cost, and easy-to-build system with millimetre accuracy has the potential to become a popular approach for measuring slope models. In addition, the performance of the MSM system is illustrated in three example applications.

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