长板-短桩复合地基加固效果现场试验研究  

Field Test Study on Reinforcement Effect of Composite Foundation By D-M Method

作　　者：姜来 殷鑫 庞德聪 黄生根[2] JIANG Lai;YIN Xin;PANG Decong;HUANG Shenggen(Hangzhou Highway Engineering Supervision&Consultant Company,Hangzhou,Zhejiang 310024,China;China University of Geosciences,Wuhan,Hubei 430074,China)

机构地区：[1]杭州公路工程监理咨询有限公司,浙江杭州310024 [2]中国地质大学(武汉),湖北武汉430074

出　　处：《施工技术》2020年第16期112-116,共5页Construction Technology

摘　　要：以宁波穿山港站软基处理工程为背景,对长板-短桩复合地基进行了现场试验,归纳、总结了复合地基关键物理量的变化规律。试验研究表明:在整个施工过程中,地基土在短时间内产生了较大沉降,长板-短桩复合地基可取得较好的处理效果;排水板的存在以及搅拌桩将上部荷载向深层土体的传递,加速了深层土体的排水固结,引起了深层地基土的沉降;桩端的刺入作用以及桩间土孔隙水的排出,引起桩顶荷载逐渐向桩周土转移,加强了桩土协调能力,使得其沉降更加均匀。Taking the soft foundation treatment project of Ningbo Chuanshan Port Station as the background,field tests are carried out on the D-M composite foundation,and the changes of key physical quantities of the composite foundation are summarized.It is revealed that during the entire construction process,the foundation soil produced a large settlement in a short time,and the D-M composite foundation can achieve good treatment effects;the existence of the drainage plate and the mixing piles transfer the upper load of to the deep soil,accelerating the drainage and consolidation of the deep soil,causing the settlement of the deep foundation soil;the penetration of the pile tip and the discharge of pore water in the soil between the piles cause the load on the pile top gradually to transfer to the soil around the pile,strengthen the coordination of the pile and soil,and make its settlement more uniform.

关 键 词：地基 长板-短桩工法 监测 沉降 桩土应力比 地基承载力 

分 类 号：TU475.9[建筑科学—结构工程]