Abstract：In order to explore the influence of interface form and filling state on the lateral friction resistance play coefficient of reef limestone-cast-in-place piles，the reef limestone in the area of China-Malaysia Friendship Bridge was used as the research object，and the reef limestone-concrete interface shear test was carried out with a large direct shear instrument to study the strength play mechanism of coral reef limestone-concrete interface in the intact rock state，and the lateral resistance play factor of coral reef limestone layer - cast-in-place pile in the fractured and more fractured rock state was studied in combination with the field self-balancing pile test. The results show that：(1) when the interface between reef limestone and concrete is not filled or filled with mud skin，the interface damage is sliding friction，and when concrete is poured directly with reef limestone，the interface damage is controlled by the internal defects of reef limestone；(2) When the reef limestone and the cast-in-place pile are not cemented，the shear strength of the saw tooth interface is higher than that of the straight pile interface，about 77%；(3) When the reef limestone is cemented with the cast-in-place pile，due to the diffusion and filling of the cement slurry，the reef limestone-concrete interface forms an interface reinforcement. The failure surface of reef limestone-concrete specimens is controlled by the internal defects of the reef limestone. The interface form does not significantly improve the shear strength of the interface；(4) Combined with the field self-balancing test pile test，it is determined that the coefficient of lateral friction resistance of the rock-socketed section of the rock-socketed pile in the reef limestone stratum with the broken rock of clear water pore-forming process is 0.053–0.108，which is more than 2 times higher than that of the land source rock. The above results demonstrate that the clear-water pore-forming cast-in-place pile can give full play to the bearing performance of reef limestone strata，and can provide reference for the design and construction of large-scale engineering infrastructure on islands and reefs.
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2023, Vol. 42 
