強夯+CFG樁復(fù)合地基在較厚回填土中的應(yīng)用
鄭宇1，王天勇2，楊錚1，金燦國1，王建華1，張相勇1，董素芹3
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鄭宇1，王天勇2，楊錚1，金燦國1，王建華1，張相勇1，董素芹3（1 北京市建筑設(shè)計研究院有限公司，北京100045；2 鄂爾多斯市城投房地產(chǎn)開發(fā)有限公司，鄂爾多斯017100；3 內(nèi)蒙古農(nóng)業(yè)大學(xué)職業(yè)技術(shù)學(xué)院建筑工程技術(shù)系，包頭014000）［摘要］通過工程實例，介紹了在較厚回填土中采用強夯+CFG樁復(fù)合地基進行地基處理以提高地基承載力及控制沉降的設(shè)計及施工方法。強夯后對表層土進行標(biāo)準(zhǔn)貫入試驗及靜力載荷試驗，打入CFG樁后對復(fù)合地基承載力進行單樁復(fù)合地基靜載荷試驗與單樁豎向抗壓靜載荷試驗檢測，結(jié)果表明地基承載力與變形均滿足規(guī)范要求。工程實例表明采用此方法可節(jié)約造價、縮短工期且安全可靠。［關(guān)鍵詞］強夯；CFG樁；回填土；地基處理中圖分類號：TU472.99 文獻標(biāo)識碼：A 文章編號：1002-848X(2013)02-0079-04Application of dynamic compaction and CFG pile composite foundation in the treatment of thick backfillZheng Yu1, Wang Tianyong2, Yang Zheng1, Jin Canguo1, Wang Jianhua1, Zhang Xiangyong1, Dong Suqin3(1 Beijing Institute of Architectural Design, Beijing 100045, China; 2 Erdos City Investment Real Estate Development Co., Ltd., Erdos 017100, China; 3 Department of Architectural Engineering Technology of Inner Mongolia Agricultural University, Baotou 014000, China)Abstract: The design and construction method of dynamic compaction plus cement fly-ash grave (CFG) pile were introduced to enhance the bearing capacity of foundation and control foundation settlement in thick backfill by an engineering example. The standard penetration test and static loading test were carried out to topsoil compacted by dynamic compaction, and the bearing capacity of the composite foundation processed by dynamic compaction and CFG was detected by static loading test of single pile composite foundation and vertical compression static loading test of single pile. The results show that the bearing capacity and deformation of composite foundation are acceptable and can meet the requirement of related codes. Moreover, the engineering example shows this method can shorten the construction period and is economic, convenient and safe.Keywords: dynamic compaction; cement flyash grave pile; backfill; foundation treatment參考文獻［1］ 段士偉.強夯加固影響深度之討論［J］.建筑結(jié)構(gòu)，2000,30（5）：53-56.［2］ JGJ 79—2002 建筑地基處理技術(shù)規(guī)范［S］.北京：中國建筑工業(yè)出版社，2002.［3］ GB 50007—2011 建筑地基基礎(chǔ)設(shè)計規(guī)范［S］.北京：中國建筑工業(yè)出版社，2012.［4］ 佟建興, 胡志堅. CFG樁復(fù)合地基承載力確定［J］.土木工程學(xué)報，2005,38（7）：87-91.［5］ 朱炳寅，婁宇，楊琦，等. 建筑地基基礎(chǔ)設(shè)計方法及實例分析［M］.北京：中國建筑工業(yè)出版社，2007.
