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.

物理模型试验被认为是有用的工具，广泛用于滑坡研究。斜坡模型的三维 (3D) 表面变形为研究滑坡的行为和机制提供了有用的信息。在这项研究中，提出并开发了一种称为多智能手机测量 (MSM) 系统的测量系统，用于测量边坡模型的 3D 表面变形。该系统包括九个相同的智能手机、一个USB集线器、一个控制软件包和一些后处理软件。通过硬件设备同时捕获一系列高质量图像，然后使用包括 3D 重建和粒子图像测速在内的后处理软件进行处理。与激光扫描仪的结果进行了比较，并在两种静态模型和一种动态斜坡模型中测试了 MSM 系统的性能。使用云到云距离的均方根误差 (RMSE) 评估系统的准确性。结果表明，MSM 系统对于静态和动态模型的精度均小于 1.1 mm。具有毫米精度的短周期、低成本且易于构建的系统有可能成为测量坡度模型的流行方法。此外，MSM 系统的性能在三个示例应用中进行了说明。具有毫米精度的低成本且易于构建的系统有可能成为测量坡度模型的流行方法。此外，MSM 系统的性能在三个示例应用中进行了说明。具有毫米精度的低成本且易于构建的系统有可能成为测量坡度模型的流行方法。此外，MSM 系统的性能在三个示例应用中进行了说明。