强夯+CFG桩复合地基在较厚回填土中的应用
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郑宇1，王天勇2，杨铮1，金灿国1，王建华1，张相勇1，董素芹3（1 北京市建筑设计研究院有限公司，北京100045；2 鄂尔多斯市城投房地产开发有限公司，鄂尔多斯017100；3 内蒙古农业大学职业技术学院建筑工程技术系，包头014000）［摘要］通过工程实例，介绍了在较厚回填土中采用强夯+CFG桩复合地基进行地基处理以提高地基承载力及控制沉降的设计及施工方法。强夯后对表层土进行标准贯入试验及静力载荷试验，打入CFG桩后对复合地基承载力进行单桩复合地基静载荷试验与单桩竖向抗压静载荷试验检测，结果表明地基承载力与变形均满足规范要求。工程实例表明采用此方法可节约造价、缩短工期且安全可靠。［关键词］强夯；CFG桩；回填土；地基处理中图分类号：TU472.99 文献标识码：A 文章编号：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参考文献［1］ 段士伟.强夯加固影响深度之讨论［J］.建筑结构，2000,30（5）：53-56.［2］ JGJ 79—2002 建筑地基处理技术规范［S］.北京：中国建筑工业出版社，2002.［3］ GB 50007—2011 建筑地基基础设计规范［S］.北京：中国建筑工业出版社，2012.［4］ 佟建兴, 胡志坚. CFG桩复合地基承载力确定［J］.土木工程学报，2005,38（7）：87-91.［5］ 朱炳寅，娄宇，杨琦，等. 建筑地基基础设计方法及实例分析［M］.北京：中国建筑工业出版社，2007.
