Abstract
Rock-like materials often exhibit irregular failure deformation under long-term service conditions, and the deformation and failure of asphalt and concrete materials is a serious problem that leads to subgrade failure. In this study, two different viscous/brittle rock-like materials were prepared by the in situ loading and optical speckle synchronous monitoring test method, and the evolution characteristics of the deformation field were studied during compression. The formation process of the compression deformation localization of rock-like materials and their relationship with stability were analyzed. A quantitative description of the compression deformation stage and localization characteristics of the viscous/brittle rock-like materials is presented. The results can be summarized as follows. At the initial stage of compression, the deformation localization zone of viscous/brittle rock-like materials begins to expand from the middle area to the surrounding area. Preliminary results of the deformation localization of the linear elastic deformation stage were obtained. The failure cloud image is completely formed at the peak, which is consistent with the failure physical map. The deformation process of compression can be quantitatively described using the deformation localization characteristics of rock-like materials.
Highlights
A group of 50 asphalt specimens were tested based on the relationship between service stability and deformation localization of viscous/brittle rock-like materials
A group of 50 concrete specimens were tested, and 2165 speckle images were collected in each specimen loading process image system. ree representative data items were selected for each
The specimen enters the stage of linear elastic deformation, the deformation localization zone of the concrete specimen gradually develops, and the speckle interference fringe begins to expand from the middle of the two sides
Summary
E loading system and the digital speckle acquisition system were calibrated, so that the time of data collection by the entire test system during the test was consistent. E test data for the entire loading process were collected until the specimen was destroyed. A group of 50 asphalt specimens were tested based on the relationship between service stability and deformation localization of viscous/brittle rock-like materials. A group of 50 concrete specimens were tested, and 2165 speckle images were collected in each specimen loading process image system. A group of 50 concrete specimens were tested, and 2165 speckle images were collected in each specimen loading process image system. ree representative data items were selected for each
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