长板-短桩工法承载特性参数影响分析  

Influence Analysis of Bearing Characteristic Parameters of D-M Method

作　　者：董必昌[1] 张明轩 张鹏飞[1] 瞿中颖 黄伟健 DONG Bichang;ZHANG Mingxuan;ZHANG Pengfei;QU Zhongying;HUANG Weijian(School of Transportation and Logistic Engineering,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]武汉理工大学交通与物流工程学院,武汉430063

出　　处：《武汉理工大学学报（交通科学与工程版）》2024年第4期748-753,759,共7页Journal of Wuhan University of Technology（Transportation Science & Engineering）

摘　　要：文中采用有限元数值仿真的方法研究了长板-短桩工法处理吹填土地基的承载特性以及桩间距、桩长、塑料排水板间距三个因素对长板-短桩法吹填土复合地基承载特性的影响规律.结果表明:①桩长对长板-短桩复合地基的影响在于能有效控制地基沉降与提供承载力,在有效桩长范围内,桩长越长效果越好;②桩间距主要影响粉喷桩与桩间土承受的应力与面积置换率,桩间距越小,长板-短桩复合地基承载能力就越大;③塑料排水板对长板-短桩复合地基的影响在于提升桩间土的渗透系数,在一定范围内,排水板越是密集,固结沉降速度越快,能有效提高桩间土的承载力;④提出了对于不同厚度吹填土地基其最优长板-短桩复合地基参数设计.The finite element numerical simulation method was used to study the bearing characteristics of dredger fill foundation treated by long plate-short pile method,and the influence and law of pile spacing,pile length and plastic drainage plate spacing on the bearing characteristics of dredger fill composite foundation by D-M method were analyzed.The results show that:①The influence of pile length on long-slab-short pile composite foundation lies in that it can effectively control foundation settlement and provide bearing capacity.Within the range of effective pile length,the longer the pile length,the better the effect.②The pile spacing mainly affects the stress and area replacement rate of soil between DJM piles and piles.The smaller the pile spacing,the greater the bearing capacity of long slab-short pile composite foundation.③The influence of plastic drainage boards on long-slab-short pile composite foundation lies in improving the permeability coefficient of soil between piles.In a certain range,the denser drainage boards are,the faster the consolidation settlement speed is,which can effectively improve the bearing capacity of soil between piles.④The optimal parameter design of long slab-short pile composite foundation for dredger fill foundation with different thickness is put forward.

关 键 词：岩土工程 吹填土 长板-短桩工法 承载特性 ABAQUS 

分 类 号：U416[交通运输工程—道路与铁道工程]