基于附加应力法的刚性桩复合地基沉降影响参数分析  

Analysis of Settlement Influence Parameters of Rigid Composite Foundation Based on Additional Stress Method

作　　者：付有为 贺佐跃 FU Youwei;HE Zuoyue(Guangdong Communication Planning&Design Institute Group Co.,Ltd.,Guangzhou 510507,China)

机构地区：[1]广东省交通规划设计研究院集团股份有限公司,广州510507

出　　处：《科技和产业》2024年第14期186-191,共6页Science Technology and Industry

摘　　要：针对现有文献中刚性桩复合地基沉降的影响因素分析较为缺乏这一问题,基于刚性桩复合地基的附加应力法,对地基土、刚性桩、路堤等因素对加固区沉降、中性面深度、负摩擦力等的影响规律进行了分析。研究结果表明,加固区沉降随淤泥质粉质黏土压缩模量、工作垫层厚度、工作垫层侧阻力逐渐增加;中性面深度随工作垫层厚度逐渐增加,但随工作垫层侧阻力逐渐减小;负摩擦力均随工作垫层厚度、工作垫层侧阻力逐渐增加。加固区沉降均随桩端土极限端阻力、总极限端阻力和单桩极限承载力逐渐增加。相对于开口条件,桩端为闭口时,桩端阻力较大,单桩承载力较高,加固区沉降较小。加固区沉降均随路堤高度、路堤填料重度、路堤顶宽和路堤边坡坡率逐渐增加;中性面深度和负摩擦力也随之呈现增加趋势。此研究结果可为刚性桩复合地基设计与计算提供一定参考。In view of the lack of analysis of influencing factors of settlement of rigid pile composite foundation in existing literatures,the influence rules of foundation soil,rigid pile,embankment and other factors on settlement,neutral surface depth,negative friction,etc.was analyzed,based on the additional stress method of rigid pile composite foundation.The results show that the settlement of the reinforced area increases gradually with the compression modulus of silty clay,the thickness of working cushion and the side resistance of working cushion.The depth of neutral surface increases gradually with the thickness of working cushion,but decreases gradually with the side resistance of working cushion.The negative friction increases gradually with the thickness of the working cushion and the side resistance of the working cushion.The settlement in the reinforced area increases gradually with the ultimate resistance of the pile end soil,the total ultimate resistance and the ultimate bearing capacity of single pile.Compared with the opening condition,when the pile end is closed,the pile end resistance is larger,the single pile bearing capacity is higher,and the settlement of the reinforced area is smaller.The settlement of the reinforced area increases gradually with embankment height,embankment filling weight,embankment top width and embankment side slope ratio.The depth of the neutral surface and the negative friction force also show an increasing trend.The research results can provide some reference for the design and calculation of rigid pile composite foundation.

关 键 词：刚性桩 复合地基 影响因素 加固区沉降 附加应力法 

分 类 号：TU447[建筑科学—岩土工程]