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摘要：南水北调中线一期穿黄工程北岸竖井外围灰浆防渗墙设计墙厚0.8m、墙深71.6m，成墙工艺由原设计的自凝成墙工艺改为泵送置换成墙工艺，施工时采用液压抓斗或液压铣槽机成槽，重锤法检测成槽质量，气举法清孔后，采用泥浆泵抽出槽孔中的泥