静钻根植桩在轨道交通工程中的抗压承载性能研究

Study on Compressive Bearing Capacity of Pre-Bored Grouting Planted Nodular Pile in Rail Transit Engineering

静钻根植桩采用埋入法施工预应力预制桩,是一种非常有应用潜力的桩型。本文在宁波轨道交通工程某高架区间现场进行了非工程部位的静钻根植桩的抗压承载性能研究,并与相邻钻孔灌注工程桩进行对比。结果表明,相同地质条件下直径800 mm的静钻根植桩的抗压极限承载力比直径1200 mm的钻孔灌注桩高约30%,而且估算造价比后者低约32%。鉴于静钻根植桩良好的抗压承载性能和显著的经济优势,今后可在轨道交通工程中推广应用。

Pre-bored grouting planted nodular pile(PGPN pile)is a kind of pile with great application potential,which uses embedding method to construct pre-stressed precast pile.In this paper,the com-pressive bearing capacity of the PGPN piles which are located a few meters away from the bored pile foundation of a viaduct of Ningbo rail transit project,is tested and compared with that of the adjacent bored piles.The result shows that under the same geological condition,the ultimate compressive bearing capacity of 800 mm diameter PGPN pile is about 30%higher than that of 1200 mm diameter bored pile and the estimated cost is about 32%lower.In view of the good per-formance of compressive bearing capacity and remarkable cost saving advantages,the PGPN pile can be widely applied in rail transit engineering in the future.