摘   要：基于6根工程试桩的资料，对比分析了新型带肋预应力管桩和传统光滑圆管桩的Q-S曲线，并结合成桩前后桩周土的标准贯入试验和静力触探试验，分析该新型桩类对桩周土的挤土效应。试验表明，新型带肋预应力管桩的荷载变形曲线相对平缓，极限承载力比等直径光滑圆管桩提高15%以上，挤土效果明显。

Abstract：Based on the field tests datas of six piles, the Q-S (load-displacement) curves of the new type of prestressed piles with rib were compared to the  traditional smooth circular piles. And then according to the data measured by the standard penetration test (SPT) and cone penetration test (CPT) of the soil around the new type of piles, before or past the time of pile-construction, the soil squeezing efficiency was analysed. The results indicated that the load-displacement curves of the new type of prestressed piles with rib were expressed relatively even, and the ultimate bearing capacity of the new type of prestressed piles was increased 15% than that of smooth circular piles with equal diameter, obviously, the soil squeezing efficiency of the new type of piles was higher.