扩底抗拔桩在软黏土地区承载特性的试验研究

Experimental Study on Bearing Capacity of Enlarged-base Uplift Piles in Soft Clay Area

结合深圳前海湾软黏土区某工程的扩底抗拔桩足尺试验,试验对桩基位移、桩身伸长率和桩基回弹率进行初步研究。试验结果显示:扩底抗拔桩在深圳前海湾软黏土中完全适用,相对于等截面抗拔桩,其极限承载力可提升50%以上,Q-S曲线更加平缓,后期桩基承载力表现更稳定。

A full-scale test on the enlarged-base uplift pile in soft clay area was carried out in Shenzhen Qianhai Bay. The displacement of pile foundation,the elongation of pile body and the rebound ratio of pile foundation are studied. The test results show that the enlarged-base uplift pile is applicable to the soft clay area in Qianhai Bay,which is relative to the equal section uplift pile,the Q-S curve is smoother,the ultimate bearing capacity can be increased by more than 50% and performs more stability in the later stage.