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挤扩支盘桩是近年来新兴的一种变截面桩型,具有承载力高、沉降小,施工机具简单等优点。针对我国沿海地区软土地基,开展了挤扩支盘桩的竖向抗拔静载荷试验,得到了极限抗拔承载力。通过试桩的桩身内力测试,得到桩身轴力的分布规律,研究了挤扩支盘桩的荷载传递机理和抗拔承载性能。试验结果表明,挤扩支盘桩的竖向抗拔承载力比普通直孔桩有明显提高,具有良好的经济性和广阔的应用前景。
Squeezed and expanded branch pile is a new type of variable cross-section pile in recent years, with the advantages of high bearing capacity, small settlement, simple construction machinery and so on. Aimed at the soft ground in the coastal area of China, the vertical anti-pull static load test of squeezed branch pile was carried out, and the ultimate pull-out bearing capacity was obtained. Through the pile internal force test of test pile, the distribution rule of pile axial force is obtained, and the load transfer mechanism and anti-pull bearing capacity of the pile are studied. The test results show that the vertical pull-out bearing capacity of the expanded branch pile is obviously higher than that of ordinary straight-hole pile, which has good economy and broad application prospect.