姚  勇^1,2    吴兴序¹
（1 西南交通大学土木工程学院  成都 610031； 2 西南科技大学土木工程学院  绵阳 621002）

[提要]  桩端压力灌浆技术用于灌注桩能明显改变桩的承载性能，提高桩的承载力，减小桩的沉降，对地层的适应性强，但在不同地层中其灌浆效果是不同的。结合某工程桥梁桩基现场试验，对卵石层中的钻孔桩采用桩端压力灌浆技术进行了试验研究并对灌浆后桩的位移、侧摩阻力、端阻力等承载特性进行了分析。
[关键词]  钻孔桩  压力灌浆  承载特性  卵石层

As the technique of pressure grouting under the tip of bored piles is introduced, it betters bearing properties of piles, improves bearing capacity and reduces settlement. Although this technique is adaptable to various soil stratum, the effect is different in different soil stratum. Based on in-site test of piles in one project, this paper investigates the application of this technique to bored piles in gravel and analyzes the bearing properties of the grouted piles.
Keywords: bored pile; pressure grouting; bearing properties; gravel