基于CEL法的砂土中相邻XCC桩贯入对既有XCC单桩影响的研究  

Study on the Influence of Adjacent XCC Pile on Existing XCC Single Pile in Sand Based on CEL Method

作　　者：周鹏 夏良利[1] 刘汉龙[3] 徐长节 崔杰[2] 曹光伟[4] 丁选明[3] ZHOU Peng;XIA Liang-li;LIU Han-long;XU Chang-jie;CUI Jie;CAO Guang-wei;DING Xuan-ming(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,Jiangxi,China;Earthquake Engineering Research&.Test Center,Guangzhou University,Guangzhou 510006,Guangdong,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China;Zijin School of Geology and Mining,Fuzhou University,Fuzhou 350116,Fujian,China)

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013 [2]广州大学工程抗震研究中心,广东广州510006 [3]重庆大学土木工程学院,重庆400045 [4]福州大学紫金地质与矿业学院,福建建福州350116

出　　处：《中国公路学报》2024年第4期141-154,共14页China Journal of Highway and Transport

基　　金：国家自然科学基金青年科学基金项目(52308352);国家自然科学基金重点项目(52238009);江西省自然科学基金青年科学基金项目(20232BAB214082);江西省教育厅科学技术研究项目(GJJ2200681);广东省地震工程与应用技术重点实验室开放基金项目(2020B1212060071)。

摘　　要：目前现浇X形桩(XCC桩)的研究主要集中于黏土地基,而对于砂土中XCC桩的相关研究却很少;此外,在研究XCC桩贯入问题时,主要分析的是沉桩挤土效应,而忽略了实际工程施工中挤土位移荷载会对邻近既有桩产生附加桩身响应这一关键问题。为此,利用耦合的欧拉-拉格朗日(CEL)大变形数值技术,建立了相邻贯入XCC桩-砂土-既有XCC桩的整体CEL有限元数值模型,并且将数值结果与室内模型试验测量数据进行比较,验证了CEL数值技术在分析相邻XCC桩-土体-既有XCC桩相互作用的可行性和有效性。然后,开展了一系列参数研究,探讨了贯入深度、相邻桩与既有桩的间距、既有桩桩头边界条件等因素对既有桩侧向响应的影响。最后,基于参数分析的结果,编制了一套可用于岩土工程师在设计初期阶段评估相邻XCC桩贯入引起的既有XCC桩最大侧向响应的设计图,以减轻桩基施工带来的相关风险。At present, research on XCC piles has mainly focused on clay foundations;however, there has been little research on XCC piles in sand. In addition, the compaction effect of a pile had been mainly analyzed when the penetration of the XCC pile was studied, while ignoring the key problem that these compaction displacement loads produce additional pile responses to adjacent existing piles in actual engineering constructions. Therefore, this study adopted a Coupled Eulerian-Lagrangian(CEL) large deformation numerical technique for establishing an integrated CEL finite element numerical model of an adjacent XCC pile-sand-existing XCC pile. The numerical results were compared with the measured data from indoor model tests, which verified the feasibility and validated the CEL numerical technique for analyzing adjacent XCC pile-soil-existing XCC pile interactions. Subsequently, a series of parametric studies were performed to explore the influences of the penetration depth, spacing between adjacent piles and existing piles, and boundary conditions of the existing pile head on the lateral response of the existing pile. Finally, based on the results of the parametric analysis, a set of design charts that can be used by geotechnical engineers to evaluate the maximum lateral response of existing XCC piles caused by the penetration of adjacent XCC piles at the early design stage were developed to mitigate the risks associated with pile foundation construction.

关 键 词：路基工程 XCC桩 CEL大变形数值技术 砂土 侧向响应 设计图 

分 类 号：U416.1[交通运输工程—道路与铁道工程]