| HYDRAULIC ENGINEERING |
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Experimental study of the influence of rocks on the interlayer shear behavior of rock-filled concrete |
| REN Mingqian1, AN Xuehui1, TAN Ni2, LI Pengfei2 |
1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China;
2. School of Hohai, Chongqing Jiaotong University, Chongqing 400074, China |
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Abstract The shear resistance of rock-filled concrete (RFC) interlayers depends on the interaction between the exposed rock corners and the surrounding self-compacting concrete (SCC). This study uses 24 small direct shear tests of RFC joints to analyze the effects of the aggregate strength, exposure height and number, and normal pressure on the shear behavior of RFC joints. The results show that the aggregate significantly influences the RFC joint shear strength. Two typical failure modes are observed with compressive plastic failure of the SCC and direct shear failure of the shear rocks. The exposed height, number and strength of the aggregate as well as the normal pressure all affect the shear capacity and failure mode. Shear stress transfer theory of concrete cracks is used to develop a design method that considers the two failure modes for the RFC interlayer shear capacity. The method is verified by the test results and provides a design method for RFC interlayer shear predictions.
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| Keywords
hydraulic concrete
rock-filled concrete
interlayer shear behavior
shear transfer
aggregate interlock
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Issue Date: 19 December 2019
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2019,
Vol. 59
