第36卷第10期 北京科技大学学报 Vol.36 No.10 2014年10月 Journal of University of Science and Technology Beijing 0ct.2014 框筒结构高层建筑CFG桩复合地基基底反力及变形 特征 佟建兴四，周圣斌，杨新辉，孙训海，罗鹏飞，闫明礼 中国建筑科学研究院地基基础研究所，北京100013 ☒通信作者，Emai:tixcabr(@sina.com 摘要采用有限压缩层地基上中厚板等参元共同作用分析程序，对C℉G桩复合地基分区不均匀布桩模型进行数值计算，并 与均匀天然地基模型和C℉G桩复合地基均匀布桩模型进行对比分析.研究发现，采用强化核心筒区布桩、相对弱化外框架柱 区布桩的不均匀布桩优化模型，核心筒最大沉降和筏板相对挠曲均明显小于均匀布桩模型，对控制核心筒部位的绝对沉降量 和筏板相对挠曲效果明显.不均匀布桩模型的基底反力分布与均匀布桩模型具有明显区别，和复合土层模量分布相关性明 显：核心筒周边外扩1倍板厚范围内基底反力最高，分布较为均匀，基本呈线性分布：核心筒荷载有效传递范围为核心筒周边 外扩2.5倍板厚区域，核心筒周边外扩1倍板厚至2.5倍板厚区域基底反力逐步衰减：核心筒周边外扩2.5倍板厚范围以外 的外框柱区域基底反力最低，分布较为均匀，基本呈线性分布：基底反力总体呈盆形分布. 关键词高层建筑：复合地基：桩：基底反力：变形特征：数值模拟 分类号TU472.3 Base reaction and deformation characteristics of CFG pile composite foundation for high-rise building with framed-tube structure TONG Jian-xing,ZHOU Sheng-bin,YANG Xin-hui,SUN Xun-hai,LUO Peng fei,YAN Ming-li Institute of Foundation Engineering,China Academy of Building Research,Beijing 100013,China Corresponding author,E-mail:tixcabr@sina.com ABSTRACT The base reaction of CFG pile composite foundation with non-uniform pile arrangement was numerically calculated by applying interaction analysis software that can consider the isoparametric elements of medium plates on a limited compressible founda- tion,and it was compared with that of uniform natural foundation and CFG pile composite foundation with uniform pile arrangement. The results show that if the piles are placed more densely at the core tube area than the external frame column area,the maximum settlement and the raft's relative deflection are obviously smaller than those of the uniform pile arrangement.The base reaction distri- bution of non-uniform pile arrangement is quite different from that of uniform pile arrangement and it correlates well to the modulus of the composite earth layer:the base reaction is the largest and distributes evenly,nearly a linear distribution,within the extent of I time the slab thickness surrounding the core tube area;the effective transfer range of load is 2.5 times the slab thickness,and the base reac- tion gradually decreases within the extent from I time to 2.5 times the slab thickness surrounding the core tube area:the base reaction reaches minimum outside 2.5 times the slab thickness and distributes uniformly,almost following a linear distribution.On the whole, the base reaction shows a basin-shaped distribution. KEY WORDS high-rise buildings:composite foundations:piles:base reaction:deformation characteristics:numerical simulation 以CFG桩为主要桩型的刚性桩复合地基具有 地基消除不均匀变形具有很好的适应性.20多年 承载力提高幅度大、地基变形小等特点，并对不均匀 来，随着国内城市建设规模的不断扩大，相关学者和 收稿日期：201406-22 DOI:10.13374/j.issn1001-053x.2014.10.020:http:/journals.ustb.edu.cn第 36 卷 第 10 期 2014 年 10 月 北京科技大学学报 Journal of University of Science and Technology Beijing Vol． 36 No． 10 Oct． 2014 框筒结构高层建筑 CFG 桩复合地基基底反力及变形 特征 佟建兴，周圣斌，杨新辉，孙训海，罗鹏飞，闫明礼 中国建筑科学研究院地基基础研究所，北京 100013  通信作者，E-mail: tjxcabr@ sina． com 摘 要 采用有限压缩层地基上中厚板等参元共同作用分析程序，对 CFG 桩复合地基分区不均匀布桩模型进行数值计算，并 与均匀天然地基模型和 CFG 桩复合地基均匀布桩模型进行对比分析． 研究发现，采用强化核心筒区布桩、相对弱化外框架柱 区布桩的不均匀布桩优化模型，核心筒最大沉降和筏板相对挠曲均明显小于均匀布桩模型，对控制核心筒部位的绝对沉降量 和筏板相对挠曲效果明显． 不均匀布桩模型的基底反力分布与均匀布桩模型具有明显区别，和复合土层模量分布相关性明 显: 核心筒周边外扩 1 倍板厚范围内基底反力最高，分布较为均匀，基本呈线性分布; 核心筒荷载有效传递范围为核心筒周边 外扩 2. 5 倍板厚区域，核心筒周边外扩 1 倍板厚至 2. 5 倍板厚区域基底反力逐步衰减; 核心筒周边外扩 2. 5 倍板厚范围以外 的外框柱区域基底反力最低，分布较为均匀，基本呈线性分布; 基底反力总体呈盆形分布． 关键词 高层建筑; 复合地基; 桩; 基底反力; 变形特征; 数值模拟 分类号 TU 472. 3 Base reaction and deformation characteristics of CFG pile composite foundation for high-rise building with framed--tube structure TONG Jian-xing ，ZHOU Sheng-bin，YANG Xin-hui，SUN Xun-hai，LUO Peng-fei，YAN Ming-li Institute of Foundation Engineering，China Academy of Building Ｒesearch，Beijing 100013，China  Corresponding author，E-mail: tjxcabr@ sina． com ABSTＲACT The base reaction of CFG pile composite foundation with non-uniform pile arrangement was numerically calculated by applying interaction analysis software that can consider the isoparametric elements of medium plates on a limited compressible founda￾tion，and it was compared with that of uniform natural foundation and CFG pile composite foundation with uniform pile arrangement． The results show that if the piles are placed more densely at the core tube area than the external frame column area，the maximum settlement and the raft’s relative deflection are obviously smaller than those of the uniform pile arrangement． The base reaction distri￾bution of non-uniform pile arrangement is quite different from that of uniform pile arrangement and it correlates well to the modulus of the composite earth layer: the base reaction is the largest and distributes evenly，nearly a linear distribution，within the extent of 1 time the slab thickness surrounding the core tube area; the effective transfer range of load is 2. 5 times the slab thickness，and the base reac￾tion gradually decreases within the extent from 1 time to 2. 5 times the slab thickness surrounding the core tube area; the base reaction reaches minimum outside 2. 5 times the slab thickness and distributes uniformly，almost following a linear distribution． On the whole， the base reaction shows a basin-shaped distribution． KEY WOＲDS high-rise buildings; composite foundations; piles; base reaction; deformation characteristics; numerical simulation 收稿日期: 2014--06--22 DOI: 10． 13374 /j． issn1001--053x． 2014． 10． 020; http: / /journals． ustb． edu． cn 以 CFG 桩为主要桩型的刚性桩复合地基具有 承载力提高幅度大、地基变形小等特点，并对不均匀 地基消除不均匀变形具有很好的适应性． 20 多年 来，随着国内城市建设规模的不断扩大，相关学者和