- 摘 要
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（1 同濟大學建筑工程系, 上海 200092； 2 國網(wǎng)四川省電力公司經(jīng)濟技術研究院, 成都 610041）
［摘要］《建筑地基基礎設計規(guī)范》（GB 50007—2011）和《架空輸電線路基礎設計技術規(guī)程》（DL/T 5219—2014）要求基礎寬高比不超過2-5且偏心距不超過1/6基礎寬度，對寬高比大于2-5的混凝土獨立基礎基底反力分布模式并未給出相關規(guī)定。首先，對9個混凝土獨立擴展基礎進行室外試驗；其次，對不同寬高比混凝土擴展基礎的基底反力分布規(guī)律進行對比分析，并探討了寬高比、偏心率、土體類型對基底反力分布的影響；最后，在試驗結果的基礎上，針對此類大寬高比混凝土獨立擴展基礎給出了基底反力取值建議。結果表明：大寬高比混凝土獨立擴展基礎在軸壓荷載作用下，基底反力分布模式總體為中間大、邊緣??；在大偏壓荷載作用下，基底反力的最大值可能出現(xiàn)在基底邊緣附近。試驗成果可為寬高比大于2-5的混凝土擴展基礎彎矩計算提供實際依據(jù)。
［關鍵詞］混凝土獨立擴展基礎； 大寬高比； 基底反力分布模式； 室外試驗
中圖分類號：TU471+.11文獻標識碼：A文章編號：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
*國家電網(wǎng)科技項目（52199915002M）。
作者簡介：李元齊，博士，教授，博士生導師，Email: liyq@#edu.cn。
