夯扩桩及载体桩在西安黄土地区应用实例及分析

Application of ramming piles and ram-compacted piles with bearing base in loess areas of Xi'an

夯扩桩及载体桩均属于摩擦端承桩,选择合适的持力层并保证夯扩头及载体质量尤为关键。本文通过对西安市渭河及其支流冲积阶地和黄土台塬共6个工程实例的简要分析,说明夯扩桩和载体桩在西安黄土地区有广泛的应用前景,同时也总结了有关两类桩基施工及检测中应该注意的有关问题及相关工程经验,并针对某一实例中不同夯扩头质量对应不同单桩竖向抗压极限承载力的情况,结合静载试验成果和低应变桩身完整性曲线作出了简要的分析,以期对今后的设计应用及施工控制有所帮助。

The ramming piles and ram-compacted piles with bearing base are belong to the friction and endbearing piles. It is particularly important to choose a suitable bearing layer and ensure the quality of the ramming tip and the bearing base. Through the brief analysis on six engineering examples based on the alluvial terraces and loess platforms along Weihe River in Xi ＇an, it is shown that the ramming piles and ram-compacted piles with bearing base are of a wide application prospect in Xi ＇ an loess areas. The related issues and engineering experience are summarized for the construction and testing of the two types of piles. Aiming at the quality of different ramming tips for a specific example to correspond the different vertical compression ultimate strength, the brief analysis is made based on the results from static load tests and low strain integrity tests, which would be helpful to the design and the construction control of the piles.