基于广义荷载传递法的扩盘桩结构优化设计  

Optimal Design of Multi-branch Pile Structure by Generalized Load Transfer Method

作　　者：李勇 熊力 周洋[3] 赫新荣 贺冠军 LI Yong;XIONG Li;ZHOU Yang;HE Xin-rong;He Guan-jun(Guangdong Road&.Bridge Construction Development Co.Ltd.,Guangzhou 510623,China;Guangdong Hualu Transport Technology Co.Ltd.,Guangzhou 510420,China;School of Civil Engineering,Henan University of Technology,Zhengzhou 45000l,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China;Zhongrong Planning and Design Co.Ltd.,Changsha 410000,China)

机构地区：[1]广东省路桥建设发展有限公司,州市510623 [2]广东华路交通科技有限公司,广州市510420 [3]河南工业大学土木工程学院,郑州市450001 [4]河海大学岩土力学与堤坝工程教育部重点试验室,南京市210098 [5]中榕规划设计有限公司,长沙市410000

出　　处：《公路》2024年第11期104-111,共8页Highway

基　　金：国家自然科学基金面上项目,项目编号42177126;广东省交通集团有限公司科技项目,项目编号JT2021YB07;郑州市R&D专项经费补助科研项目,项目编号22ZZRDZX38。

摘　　要：扩盘桩具有承载力高、沉降控制效果好的技术优势。现阶段需要建立新的设计方法,来直接指导工程设计人员进行正向的扩盘桩最优结构设计。提出了一种基于改进荷载传递法的扩盘桩结构正向设计方法,首先,引用广义荷载传递函数拟合扩盘桩静载试验得到扩盘桩的荷载传递函数参数;其次,依据桩顶荷载、位移边界条件和桩端控制性参数进行由上至下的桩身尺寸计算和盘体布置,最终实现扩盘桩结构的正向设计。进行了原位扩盘桩静载试验,并利用所提正向设计方法对原有设计方案进行优化,分析优化后方案的荷载~沉降值和施工优势。研究发现,本研究所提方法在保证安全的前提下可最大程度地发挥扩盘桩的承载优势,为优化扩盘桩设计和施工提供理论支撑。Multi-branch pile has the technical advantages of high bearing capacity and good settlement control effect.At present,it is necessary to establish a new design method to directly guide the designers to carry out the optimal structural design of the multi-branch pile.In this paper,a forward design method of multi-branch pile is proposed based on improved load transfer method.Firstly,the generalized load transfer function are fitted with static load test to obtain the load transfer function parameters of the multibranch pile.Secondly,according to the pile top load,displacement boundary condition and pile end control parameters,the pile size and branches layout are calculated from top to bottom,and finally the forward design of the multi-branch pile structure is realized.In this paper,the static load test of in-situ expanded pile is carried out and the original design method is optimized by using the proposed forward design.The load-settlement theoretical value of the optimized scheme is compared with the finite element calculation to verify the effect of the new method.This method has a positive role in promoting the application and research of the multi-branch pile and its related pile types.

关 键 词：桥梁工程 扩盘桩结构设计 荷载传递法 扩盘桩静载试验 应力分析 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]