一种双排长短密排桩基础的框架海堤结构

针对目前滨海地区深厚淤泥质地基中沿海大桥与一般土石海堤交叉影响问题,通过桩型比选(钻孔灌注桩、大直径薄壁筒桩以及U形预应力板桩)、桩基布置方案比选(密排、2倍桩径间隔以及满堂布置)等深入对比分析,结合竖向承载力、水平承载力计算对比,提出了一种新型双排长短密排桩基础的框架肋板结构海堤结构;并对深厚淤泥地基进行浅层满堂固化加固处理。该新型结构能有效避免一般土石堤沉降对沿海大桥桥墩负摩擦阻力的不利影响,能有效保证大桥安全,同时能大量节省交叉段桥梁和交叉段海堤的施工工期。通过完工后的实际沉降等监测数据分析,认为该新型结构有效地保证了交叉段桥梁的安全。

A frame seawall structure of double row with long and short densely packed pile foundation

In view of the current cross influence between the coastal bridge and the general earth-rock seawall in the deep silty foundation in the coastal area,by the pile type comparison (bored pile,large-diameter thin-walled pile and U-shaped prestressed sheet pile) and pile foundation layout scheme comparison and selection (closed row,2 times pile diameter interval and all-round arrangement) and other in-depth comparative analysis,combined with vertical bearing capacity and horizontal bearing capacity calculation and comparison,a new type of ribbed structure seawall structure with double row long and short densely packed pile foundation is proposed.The deep silt foundation is all-round solidified and strengthened in shallow layer.The new structure can effectively avoid the adverse impact of the settlement of the general earth embankment on the negative frictional resistance of the pier of the coastal bridge,effectively ensure the safety of the bridge,and at the same time save the construction period of the cross section bridge and the cross section seawall.Through the analysis of monitoring data such as actual settlement after completion,it is considered that the new structure effectively ensures the safety of the bridges at the intersection.