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在论述了双向螺旋挤土灌注桩新技术优势及其在我国的快速发展和工程应用现状基础上,阐述了国内外3种双向螺旋挤土灌注桩的极限承载力计算方法及其适用条件。结合北京市及山东省的两个现场试桩实测资料,对3种极限承载力计算方法的应用结果进行了对比分析。分析结果表明:中国京冶(2010)方法和山东省标准的经验参数法是适合国内双向螺旋挤土灌注桩工程设计的简便实用方法。
Based on the discussion of the advantages of new technology of two-way spiral compaction piles and its rapid development in China and engineering applications, the calculation methods and application conditions of the ultimate bearing capacity of three types of bidirectional spiral compaction piles at home and abroad are described. Based on the measured data of two test piles in Beijing and Shandong Province, the application results of the three ultimate bearing capacity methods are compared and analyzed. The analysis results show that the method of China Jingye (2010) and the Shandong Province empirical empirical parameter method are simple and practical methods suitable for the engineering design of two-way spiral compaction piles in China.