珊瑚礁礁灰岩工程特性测试研究

珊瑚礁是一种特殊的岩土类型。运用现场钻探、标准贯入试验、波速测试、平板载荷试验等勘探手段和方法,对沙特红海珊瑚礁礁灰岩进行了含水率、重度、抗压强度等室内试验,分析研究了珊瑚礁礁灰岩的物理力学性质及相关关系。测试研究表明:岩芯采取率、岩石质量指标和标准贯入试验可以评价珊瑚礁礁灰岩沿深度的岩土性能变化特征;珊瑚礁礁灰岩具有结构多变、多孔、重度小、性脆、强度低且变化大等工程特性;珊瑚礁弹性波传播速度小,而珊瑚碎屑岩和珊瑚状石灰岩具有较高的弹性波波速;载荷试验p-s曲线与其他岩土不同,随着荷载的增大,礁灰岩空隙发生了脆性破坏,岩土被压密。测试成果可供礁灰岩的进一步研究和工程应用参考。

Experimental study on engineering properties of coral reef calcareous rock

Coral reef is a special type of rock and soil. Based on drilling, standard penetration test, elastic velocity test and plate loading test, laboratory rock tests such as moisture content, unit dry weight and uniaxial compressive strength etc. are carried out, and the physical and mechanical properties and mutual relations are analyzed and researched. It shows that the core recovery, rock quality designation and standard penetration test may evaluate the rock and soil properties change along the depth. The coral reef rocks have the engineering properties of changeable structure, porous, low density, brittleness and low strength and great change. Coral reefs have the low elastic velocity, but calcareous rocks have the high elastic velocity relatively. The pressure and settlement curves of plate loading test are differ from other rocks and soils. As the load increases, calcareous rock voids occur brittle failure, and rocks and soils are compacted. Research results are significant in coral reef area and engineering application.