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| Dynamic shear characteristics of interface between different geosynthetics and recycled concrete aggregate |
| WU Jianqi1,2, LI Lei1,2, WANG Jun3 |
1. College of Civil and Surveying Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2. Jiangxi Provincial Key Lab of Environmental Geotechnical and Engineering Disaster Control, Ganzhou 341000, China;
3. College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325035, China |
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Abstract In order to study the cyclic shear and post direct shear characteristics of the interfaces between five different geosynthetics and Recycled Concrete Aggregate (RCA), a series of Monotonic Direct Shear (MDS), Cyclic Direct Shear (CDS) and Post Cyclic Direct Shear (PCDS) tests were carried out under different normal stresses and cyclic shear displacement amplitudes. The results of post cyclic direct shear test and monotonic direct shear test were comprehensively compared and analyzed. under the action of cyclic direct shear The test results show that the five types of reinforcement-soil interface become obvious shear hardening, and the shear stiffness increases with the number of cycles, while the interface damping ratio decreases with the number of cycles. For this experiment, the shrinkage caused by the stiffened interface under the three different cyclic shear displacement conditions increase significantly with the increase of shear amplitude, the shrinkage increased respectively by 18.6% and 22.2%. In the post-cyclic direct shear test, the five stress-displacement curves of reinforced interfaces show obvious post-peak softening, and the apparent adhesion and the internal friction angle of the interface increase significantly with the cyclic shear. The results of the peak and residual cohesion and internal friction angle in the post-cycle direct shear test are greater than the corresponding results in the monotonic direct shear test.
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Received: 08 September 2020
Published: 15 January 2022
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