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一、前言近年来,日本有些地区采用了桩径2～3米的大直径灌注桩和桩尖扩至4米的扩尖桩,其使用范围亦有日益扩大的趋势。大直径灌注桩和扩尖桩承受的荷重虽然很大,但其承载力可否按1～1.5米直径的普通灌注桩的计算方法考虑,尚待进一步研究。大直径灌注桩试桩费用很高,通常多用现成公式计算,不进行载荷试
I. INTRODUCTION In recent years, in some areas of Japan, large-diameter cast-in-place piles with 2 to 3 meters of pile diameter and expanded piles with a pile tip of 4 meters have been used, and the scope of use is also expanding. The bearing capacity of large-diameter cast-in-place piles and enlarged piles is large, but the bearing capacity can be considered according to the calculation method of ordinary cast-in-place piles with a diameter of 1 to 1.5 meters, which needs further study. Large-diameter cast-in-place pile test piles are very expensive and are usually calculated using ready-made formulas. Load tests are not performed.