围压对珊瑚岩动态力学行为影响

珊瑚岩的深层打桩工程提出了研究珊瑚岩在围压作用下动态力学性能的新科学需求. 通过带围压的霍普金森压杆（SHPB）对珊瑚岩开展冲击试验，得到了不同围压下珊瑚岩的力学响应. 研究表明:无围压情况下，珊瑚岩动态抗压强度与常规岩石一样，具有明显的应变率敏感性；随着围压增加，珊瑚岩动态抗压强度不仅有显著的提高，而且其应变率敏感性更强，并归纳出含围压和应变率效应的破坏强度公式. 本文提出的强度公式对深厚覆盖层珊瑚岩地质桩基工程具有重要的参考价值. 

Study on Dynamic Behavior of Coral-Reef Limestone Under Impact Loading with Confining Pressure

The deep piling project of coral rock puts forward a new scientific demand for understanding dynamic mechanical properties of coral rocks under confining pressure. Impact tests on coral rocks were carried out through split Hopkinson pressure bar (SHPB) with confining pressure, and mechanical responses of coral rocks under different confining pressures were obtained. Studies show that: in the absence of confining pressure, the dynamic compressive strength of coral rocks is the same as that of conventional rocks, and has obvious strain rate sensitivity; as confining pressure increases, not only the dynamic compressive strength of coral rocks increases significantly, but also its strain rate sensitivity is stronger. The failure strength formula was proposed with confining pressure and strain rate effects. The proposed failure strength formula in this paper has important reference value for deep overburdened coral rock geological pile foundation engineering.