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建筑物大直径桩基础尚无设计规范,目前多用载荷试验中沉降控制法或经验公式(建工总局、铁道部、交通部的有关规程或规范中灌注拉承载力计算公式)法确定。本文结合国内外资料和工程试验数据,提出确定大直径桩承载力的沉降限值应适当提高和分别制定,介绍了梅耶霍夫提出的群桩沉降量予估公式;并用他的深基础理论和临界深度概念分析了使用上逆各规范式的适宜程度,认为铁道部、交通部的规范式较为合理,并对其进行了综合,引入临界深度15d,给出砂土地基大直径桩容许承载力计算公式,供设计者参考和讨论。
There are no design specifications for large-diameter pile foundations of buildings. Currently, the settlement control method or empirical formula (commercial regulations of the General Administration of Construction, the Ministry of Railways, and the Ministry of Communications or the specification of the calculation formula for the bearing capacity of infusion-pulls) is used in load tests to determine the foundations. Based on domestic and foreign data and engineering test data, this paper proposes that the settlement limit for determining the bearing capacity of large-diameter piles should be appropriately improved and formulated separately. The Meyerhoff proposed formula for group precipitable settlement is introduced, and his deep foundation theory is used. The concept of critical depth is used to analyze the suitability of up-and-down criterions. It is considered that the standardized forms of the Ministry of Railways and the Ministry of Communications are reasonable and integrated. The critical depth 15 d is introduced to give the allowable load of large-diameter piles on sand foundations. Force calculation formulas for designers’ reference and discussion.