The soil of coastal reclamation area is much poor,and the silt is very thick.The soil will produce great consolidation settlement under the effect of late filling soil,which makes bridge pile founda-tion produce negative skin friction easily.It will increase the load of bridge pile foundation,and reduce the bearing capacity and increase the settlement of pile foundation.Combined with the Taizhou Bay Bridge Project Construction,the field test are studied towards the effect of coastal reclamation area late filling to negative skin friction resistance of pile foundation of bridge,and there are three piles designed to test.In addition,it combines with different theoretical calculation methods to analysis negative skin fric-tion.According to the field test,when the load height is up to 4 meter and the surcharge load scale is 24 m ×16 m,the total negative skin friction is almost up to 2 687 kN,and the depth of neutral point is about 29.5 meter,nearly being 0.36 times the pile length.Besides,the development of negative skin friction changes over time.The result of domestic norm analysis is larger than field test result.The negative fric-tion should be taken fully into consideration in actual engineering.%沿海地区主要通过吹填淤泥及泥沙进行围垦，由于吹填区域土质较差，淤泥软弱土层较厚，在后期填土作用下，土体会产生很大的固结沉降，易对桥梁基础产生较大的负摩阻力，降低基桩承载力，增加桥梁的沉降位移。结合台州湾大桥工程建设，选取三根基桩进行大面积堆载下桥梁基桩负摩阻力试验，研究沿海吹填区域后期填土对桥梁基桩负摩阻力的影响，并结合不同理论方法计算值进行对比分析。现场实测结果表明，堆载高度达到4 m 高度，堆载面积为24 m ×16 m 时，负摩阻力总和达到2687 kN 左右，中性点深度约为29.5 m，约为0.36倍桩长；负摩阻力的发展是随时间而变化的，规范法计算出的负摩阻力总和计算结果比实测结果偏大，在实际工程中应充分考虑负摩阻力的影响。
展开▼
