（1 同济大学建筑工程系, 上海 200092； 2 国网四川省电力公司经济技术研究院, 成都 610041）

［摘要］《建筑地基基础设计规范》（GB 50007—2011）和《架空输电线路基础设计技术规程》（DL/T  5219—2014）要求基础宽高比不超过2-5且偏心距不超过1/6基础宽度，对宽高比大于2-5的混凝土独立基础基底反力分布模式并未给出相关规定。首先，对9个混凝土独立扩展基础进行室外试验；其次，对不同宽高比混凝土扩展基础的基底反力分布规律进行对比分析，并探讨了宽高比、偏心率、土体类型对基底反力分布的影响；最后，在试验结果的基础上，针对此类大宽高比混凝土独立扩展基础给出了基底反力取值建议。结果表明：大宽高比混凝土独立扩展基础在轴压荷载作用下，基底反力分布模式总体为中间大、边缘小；在大偏压荷载作用下，基底反力的最大值可能出现在基底边缘附近。试验成果可为宽高比大于2-5的混凝土扩展基础弯矩计算提供实际依据。

［关键词］混凝土独立扩展基础； 大宽高比； 基底反力分布模式； 室外试验

中图分类号：TU471+.11文献标识码：A文章编号：1002-848X(2018)15-0092-06

Field experimental study on reaction pressure distribution under concrete independent spread foundation with large width-to-height ratio

Li Yuanqi1, Jiao Tinglei1, Luo Jinhui1, Wang Wenguang2, Luo Mingyong2

(1 Department of Structural Engineering, Tongji University, Shanghai 200092, China; 2 State Grid Sichuan Economic Research Institute, Chengdu 610041, China)

Abstract:It is required according to Code for design of building foundation（GB 50007—2011）and Technical code for design of foundation of overhead transmission line（DL/T 5219—2014）that the width-to-height ratio of foundation should not exceed 2-5 and the eccentricity should not exceed 1/6 of the foundation width. There are no relevant regulations on the distribution of reaction pressure for concrete spread foundation with width-to-height ratio greater than 2-5. Firstly, nine concrete independent spread foundations were tested in site. Secondly, the distribution of reaction pressure under the concrete independent spread foundations with different width-to-height ratios was compared and analyzed. The effects of width-to-height ratio, eccentricity and soil type on the distribution of base reaction were also discussed. Finally, on the basis of the test results, the recommended value of the base reaction was proposed for this foundation. The results show that under the axial compression, the distribution of reaction pressure is generally large in center and small at the edge. The maximum of the reaction pressure under large eccentricity load may appear near the edge of the foundation. The test results can provide a actural basis for the calculation of bending moment of concrete spread foundation with width-to-height ratio greater than 2-5.

Keywords:concrete independent spread foundation; large width-to-height ratio; distribution mode of base reaction; in-site test

*国家电网科技项目（52199915002M）。

作者简介：李元齐，博士，教授，博士生导师，Email: liyq@tongji.edu.cn。