CM复合地基技术在特殊地质条件下的应用
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[摘 要] 对于深厚杂填土（松散，空隙率较大，且含有大量块石和老设备基础）的地质条件，采用压密注浆处理，可以提高杂填土的密实性和桩间土的承载力特征值，采用素混凝土树根桩作为CM复合地基的增强体，既提高了复合地基的承载力，又能有效地减小基础的沉降。通过工程实例介绍了CM复合地基的设计、计算方法，提出了根据变刚度调平的原则布置复合地基增强体以及复合地基増强体持力层选用强风化岩的设计思路。[关键词] CM复合地基; 褥垫层; 压密注浆; 树根桩; 处理后桩间土; 变刚度调平中图分类号：TU472.99 文献标识码：A 文章编号：1002-848X(2013)S2-0666-05Application of CM composite foundation technology in special geological conditionZhao Subei1, Xu Yonghua2 ,Xu Xinyu1,Fang Jingbo1
（1 Nanjing Huasen Architectural Engineering Designing Consultants Ltd, Nanjing 210005, China; 2 Nanjing Rain Pile Architectural Technology Co., Nanjing 210012, China）Abstract: As for the geological condition of deep miscellaneous fill (loose, bigger voidage and containing a large number of block stone and old equipment foundation), using pressure grouting secret can improve the compactness of miscellaneous fill and the characteristic value of bearing capacity of inter pile soil and using plain concrete root pile as CM composite foundation reinforcement can not only improve the bearing capacity of composite foundation but also reduce the settlement of composite foundation effectively. This article combining the engineering case introduces the designing and calculation method of CM composite foundation and put forward the designing ideas of laying out the composite foundation reinforcement by the principle of adjusting foundation rigidity to reduce differential settlement and selecting strong weathering rock for the bearing stratum of composite foundation reinforcement.Keywords: CM composite foundation; cushion; pressure grouting secret; tuberose pile; processed inter pile soil; adjusting foundation rigidity to reduce differential settlement作者简介：赵苏北，高级工程师，一级注册结构工程师, Email:njzhaosubei@163.com。
