无筋式陀螺桩-砂井地基的工作特性  

Performance features of composite foundation of top-shaped concrete blocks-sand bag well without connecting bars

作　　者：刘广宇 余彦杰 李国维[2,4] 熊力 吴建涛[2,4] LIU Guangyu;YU Yanjie;LI Guowei;XIONG Li;WU Jiantao(Erguang Branch of Guangdong Road and Bridge Construction Development Co.,Ltd.,Qingyuan,Guangdong 513300,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing,Jiangsu 210024,China;Zhejiang Electric Power Construction Company,Ningbo,Zhejiang 315000,China;Highway and Railway Research Institute,Hohai University,Nanjing,Jiangsu 210024,China;Geotechnical Research Institute,Hohai University,Nanjing,Jiangsu 210024,China)

机构地区：[1]广东省路桥建设发展有限公司二广分公司,广东清远513300 [2]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210024 [3]浙江省电力建设有限公司,浙江宁波315000 [4]河海大学道路与铁道工程研究所,江苏南京210024 [5]河海大学岩土工程科学研究所,江苏南京210024

出　　处：《岩石力学与工程学报》2021年第S01期2954-2959,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(41272327)。

摘　　要：陀螺桩垫层联合砂井固结排水作为一种新的软基处理方式取得了良好效果,然而相关的优化设计研究还未有报道。通过对比常规陀螺桩-砂井地基和无筋式陀螺桩-砂井地基的工作表现,研究联系筋在陀螺桩-砂井地基工作性状和角色。研究表明:(1)无筋陀螺桩垫层地基相比于常规陀螺桩垫层地基,沉降略大10%,侧向最大变形略大20%,且无筋式陀螺桩-砂井地基桩体的工程力学性质发挥更加充分,地基塑性区应变也与常规陀螺桩-砂井地基在相同数量级上;(2)相比于碎石桩,常规式和无筋式垫层的陀螺桩自平衡能力较强,整体性强,其具有良好的变形控制能力。总体上常规陀螺桩垫层地基与无筋陀螺桩垫层地基的综合表现较为相似,二者在沉降控制、超孔隙水压消散、桩体应力、塑性区分布等方面表现相互接近。The composite foundation of top-shaped concrete blocks(TSCB)-sand bag well(SBW)were found to perform very well in soft clayey deposit treatment.However,relevant study about the optimum design of TSCB-SBW foundation were seldom reported.This research compared the engineering performance normal TSCB-SBW foundation and the non-connecting bar(NCB)TSCB-SBW foundation to investigate the features and functions of connecting bars in the TSCB-SBW system.The results showed that(1)the NCB TSCB-SBW foundation has only 10%higher settlement and 20%larger lateral displacement than the normal TSCB-SBW foundation.In addition,the NCB TSCB-SBW foundation showed a better mechanical performance and an equivalent plastic strain with normal TSCB-SBW foundation.(2)Compared with the gravel cushion,as the excellent self-balance of TSCB,TSCB-SBW foundation behaves good integrity and deformation controlling.In general,NCB TSCB-SBW foundation and normal TSCB-SBW foundation presented similarity in settling controlling,pore pressure dissipation,stress in blocks and distribution of plastic strain.

关 键 词：地基基础 陀螺桩-砂井 垫层型式 联系筋 

分 类 号：TU47[建筑科学—结构工程]