吹填珊瑚砂压缩特性和地基处理与变形控制技术

Compression Characteristics of Dredged Coral Sand and Control Technology of Foundation Treatment and Settlement

依托印度洋马尔代夫维拉纳国际机场改扩建工程,通过室内试验和原位沉降监测揭示了珊瑚砂地基的压缩特性和长期沉降变形规律、机理及影响因素,提出珊瑚砂地层长期沉降计算公式和参数确定方法。指出可以采用重型动力触探指标用于地基处理深度检测,原位干密度测试指标用于地基处理质量控制。最后阐明珊瑚砂地层沉降变形的分类和工后沉降组成,形成机场跑道吹填珊瑚砂地基处理与变形控制技术体系。

Based on the reconstruction and extension project of Velana International Airport Maldives,the regularity,mechanism and influencing factors of the long-term settlement and deformation of coral sands are revealed through laboratory tests and field monitoring.The formula for calculating the long-term settlement of coral sand stratum and the method for determining the parameters are put forward,and it is suggested for the first time that the heavy dynamic penetration test index can be used to measure the depth of foundation treatment by means of vibration method.The in situ dry density testing index is used to control the quality of foundation treatment by vibration method.Finally,the classification of settlement deformation of coral sand stratum and the composition of post-construction settlement are expounded.The technical system of long-term deformation control after construction has been formed for the coral sand foundation of the airport runway.