长江下游某通用码头散货泊位PHC-钢管组合桩钢管桩长度确定

发布时间：2018-09-04 13:47

【摘要】：针对长江下游地区某物流通用码头散货泊位处水体较深、软土(淤泥质粉质粘土)较厚等不利岩土工程条件,确定采用PHC-钢管组合桩作为地基基础,而确定组合桩中的钢管桩长度部分尤为重要。为此,在考虑土体软化特点、桩土接触关系、桩身沉降等基础上,采用FLAC3D软件构建了PHC-钢管组合桩—土模型,进而计算了6根PHC-钢管组合桩中不同钢管长度时的桩身极限承载力、轴力、侧摩阻力。结果表明,钢管桩较短时,组合桩的极限承载力较高;改变钢管桩长度,使PHC管桩与钢管桩的接桩部位处于粉质粘土、粉细砂层时,轴力与侧摩阻力变化较大;接桩部位位于持力层时,缩短钢管桩长度会降低整桩极限承载力及接桩部位的侧摩阻力。通过对比分析钢管桩对组合桩桩身极限承载力、轴力、侧摩阻力的影响程度,最终确定组合桩中钢管桩长度5m时为最优选择。
[Abstract]:In view of the unfavorable geotechnical engineering conditions such as deep water body and thicker soft soil (silty clay) in the bulk berth of a general logistics wharf in the lower reaches of the Yangtze River, PHC- steel pipe composite pile is adopted as foundation. It is very important to determine the length of steel pipe pile in composite pile. Therefore, on the basis of considering the characteristics of soil softening, pile-soil contact relationship, pile settlement and so on, the PHC- steel pipe composite pile-soil model is constructed by using FLAC3D software. Furthermore, the ultimate bearing capacity, axial force and lateral friction of six PHC- steel pipe composite piles with different pipe lengths are calculated. The results show that the ultimate bearing capacity of the composite pile is higher when the steel tube pile is short, the axial force and lateral friction of the PHC pipe pile and the steel tube pile are changed greatly when the length of the pile is changed, and the connecting part of the PHC pipe pile and the steel tube pile is in silty clay. When the connecting pile is located in the bearing layer, shortening the length of the steel pipe pile will reduce the ultimate bearing capacity of the whole pile and the side friction of the connecting pile. By comparing and analyzing the influence of steel pipe pile on the ultimate bearing capacity, axial force and lateral friction of composite pile, the optimum selection of steel pipe pile length of 5 m in composite pile is determined.
【作者单位】：南京水利科学研究院材料结构研究所;镇江市港口建设工程质量监督站;
【基金】：江苏省“333”工程人才项目(Rq415001) 江苏省交通运输科技项目(2014T13) 南京水利科学研究院中央级公益性科研院所基本科研业务费专项资金面上项目(Y415002)
【分类号】：U656.1

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