Abstract
Digital image correlation (DIC) is a noncontact measurement technique that can visualize and measure a model body in an entire field without interference. This study performed the structural model test of a cemented sand and gravel (CSG) dam. The scale-free DIC technology was applied to the model test to monitor the CSG model dam during overload damage. The study results demonstrated the following results:1) The CSG dam experienced sliding shear failure along the dam foundation with an overload coefficient of 5.2 during failure. 2) The use of DIC technology for measurement could reflect the generation and development of the damage process of the model dam. 3) The DIC technique used in this test achieved an observation accuracy of 2 mm for displacement and 530 με for strain. 4) The conclusions of the measurement results of the DIC technique and the traditional method are identical. The DIC technique has considerable application potential in the model tests of hydro-structures. This study provides a new measurement method for hydraulic structure model tests and supports the development of an intelligent monitoring platform for subsequent hydraulic structure model tests.
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