Abstract
In order to study the tensile properties of rock-concrete composite disc specimens with different roughness, the surface of the gray-white sand specimen was artificially grooved, and six different roughness were configured. The test results show that the roughness size and roughness mode jointly control the tensile strength of the rock-concrete interface. With the increase of roughness, the tensile strength of the sample changes from the initial decrease to the increase and then decrease, and the tensile strength reaches the highest when the roughness is f3. The variation trend of pre-peak energy accumulation and post-peak energy accumulation of the sample is opposite, and the dissipation energy is closely related to the crack propagation strain. The roughness and crack closure strain, crack peak strain, crack propagation strain and crack closure stress show a sinusoidal periodic variation. The crack propagation strain is closely related to the change of dissipation energy. The change trend of crack closure stress is basically consistent with the change trend of tensile strength. Therefore, in the actual project, grasping the period of roughness variation and selecting the construction position can make the rock-concrete interface stable and get twice the result with half the effort.
Funder
National Natural Science Foundation of China
Henan Science and Technology Research Project
Key Scientific Research Project of Higher Education Institutions in Henan Province
the Fundamental Research Funds for the Universities of Henan Province
Young backbone teachers funding program of Henan Polytechnic University
he research fund of Henan Key Laboratory for Green and Efficient Mining & Comprehensive Utilization of Mineral Resources
the research fund of Jiaozuo Road Traffic and Transportation Science and Technology research center
Publisher
Public Library of Science (PLoS)