A pull-out test scheme of chemical bolt in concrete based on high-speed digital image correlation method is proposed,which can capture and analyze the deformation development and failure mode between chemical bolt and concrete.In order to achieve direct observation of the displacement and strain fields at the chemical bolt-concrete interface,a half-mould specimen was used for the test.To demonstrate its feasibility,the bond-slip response of the half-mould specimens were compared with those of the full-mould specimens.The results show that the bond-slip response of the half-mould specimens are similar to that of the full-mould specimens,which can be used to study the bond mechanism at the chemical bolt-concrete interface.Finally,the high-speed camera was used to capture the images of concrete failure time,and digital image correlation method technology was used to analyze the collected images,so as to successfully measure the displacement and strain of the interface during the destruction of chemical bolts from concrete.
pull-out testsingle chemical bolthigh-speed cameradigital images correlation method
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