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姚  勇^1,2    吳興序¹
（1 西南交通大學(xué)土木工程學(xué)院  成都 610031； 2 西南科技大學(xué)土木工程學(xué)院  綿陽 621002）

[提要]  樁端壓力灌漿技術(shù)用于灌注樁能明顯改變樁的承載性能，提高樁的承載力，減小樁的沉降，對地層的適應(yīng)性強(qiáng)，但在不同地層中其灌漿效果是不同的。結(jié)合某工程橋梁樁基現(xiàn)場試驗(yàn)，對卵石層中的鉆孔樁采用樁端壓力灌漿技術(shù)進(jìn)行了試驗(yàn)研究并對灌漿后樁的位移、側(cè)摩阻力、端阻力等承載特性進(jìn)行了分析。
[關(guān)鍵詞]  鉆孔樁  壓力灌漿  承載特性  卵石層

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