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    王  旭  于志強(qiáng)
    （西南交通大學(xué)地下與巖土工程系  成都 610031）

[提要]  對(duì)壓密灌漿法用于樁底灌漿提高鉆孔灌注樁承載力的工藝和機(jī)理進(jìn)行了探討。分析了壓密灌漿和普通灌漿的異同以及樁底壓密灌漿鉆孔樁的承載力特性，并給出了樁端持力層為粗顆粒土的壓密灌漿鉆孔樁的極限承載力經(jīng)驗(yàn)公式。
[關(guān)鍵詞]  壓密灌漿 鉆孔灌注樁 承載力

Technology and mechanism of compaction grouting used in bored pile base grouting to enhance the bearing capacity are discussed. By comparison, the authors pointed out the difference between compaction grouting and common grouting method used in bored pile base grouting. The feature of bored pile with compact toe is discussed and empirical formula of dtimate bearing capacity of bored pile when its toe is in coarse grained soil is proposed.
Keywords: compacrion grouting; bored filling pile; bearing capacity