深中通道DCM复合地基承载特性及变形规律

Bearing characteristics and deformation law of composite foundation with DCM piles in Shenzhen-Zhongshan Link

依托深中通道工程,采用原位深水载荷试验和有限元分析等方法,研究了DCM复合地基承载特性及变形规律。研究表明,深水原位载荷试验可有效反馈桩土承载特性,在满足安全的前提下,适当降低复合地基置换率可有效利用桩间土承载力,充分发挥复合地基承载能力。桩头开挖后的桩渣层是复合地基初始沉降的主要因素,施工时需采取有效的清淤措施,避免复合地基产生不均匀沉降。

Based on Shenzhen-Zhongshan Link project,the bearing characteristics and deformation law of composite foundation with DCM piles were studied by means of in-situ deep-water load test and finite element analysis.The research shows that the deep-water in-situ load test can effectively feed back the bearing characteristics of pile-soil.On the premise of safety,appropriately reducing the replacement rate of composite foundation can effectively make use of the bearing capacity of soil between piles and give full play to the bearing capacity of composite foundation.The pile slag layer after pile head excavation is the main factor for the initial settlement of composite foundation.Effective desilting measures shall be taken during construction to avoid uneven settlement of composite foundation.