水下挤密砂桩技术加固洋山深水港区软土地基数值模拟

Numerical simulation of underwater compaction sand pile technology for soft soil foundation reinforcement in the Yangshan deepwater port area

针对目前水下挤密砂桩复合地基设计计算成果与工程实际存在偏差的问题,进行了力学特性分析研究。对洋山深水港区挤密砂桩加固软土地基试验进行模拟分析,得出复合地基沉降特性、承载能力、荷载沿深度的传递和变化规律以及砂桩及桩间土对荷载的分担作用等方面的结论。对复合地基模型相关参数的不同设置进行计算比较,分析各因素的变化对复合地基变形和受力特性的影响。该研究为离岸深水港口水下软土地基加固设计提供参考。

In view of the deviation between the design and calculation results of underwater compacted sand pile composite foundation and the engineering practice,the mechanical characteristics are analyzed and studied.The test of soft soil foundation reinforced by compaction sand pile in the Yangshan deepwater port area is simulated and analyzed.Research conclusions of settlement characteristics,bearing capacity,transmission and variation law of load along the depth of the composite foundation as well as the load-sharing effect of sandpile and soil between piles are obtained.Several different related parameter settings of the composite foundation model are calculated and compared,and the influence of the changes of parameters on deformation and force characteristics of the composite foundation is analyzed.This study provides a reference for the design of underwater soft soil foundation reinforcement of offshore deep-water ports.