地下水对珊瑚砂力学性质影响分析

Analysis on the influence of groundwater to mechanical properties of coral sand

依托马尔大夫维拉纳国际机场项目,通过标准贯入、动力触探、平板载荷、螺旋板载荷、道基反应模量、加州承载比等现场原位试验,揭示了地下水位以上和水位以下珊瑚砂力学性质的差别,分析得出珊瑚砂遇水发生明显力学变化与其颗粒形状、大孔隙、水的润滑作用等因素有关。进而分析得出,机场跑道珊瑚砂地基处理的关键就是通过动力作用改变水下珊瑚砂颗粒排列,提前释放其压缩变形,并将该分析成果成功应用于马尔大夫维拉纳国际机场项目地基处理中,通过现场数据监测,地基处理取得了成功。

Based on the Maldives Velana International Airport project, through the in-situ tests with the standard penetration, dynamic penetration, plate loading, spiral plate loading, channe based reaction modulus and California load ratio, the mechanical properties of the coral sand above and below the groundwater level are revealed. The difference in mechanical properties shows that the obvious mechanical changes of coral sand in contact with water are related to the factors such as the particle shape, macropores and water lubrication. Furthermore, it is concluded that the key to the treatment of the coral sand foundation in the airport runway is to change the arrangement of the underwater coral sand particles by dynamic action and to release the compression deformation in advance, and the analysis results are successfully applied to the foundation treatment of the Maldives Velana International Airport project. Through the in-situ monitoring, the ground treatment is successful.