吴发名,段兴平,徐进鹏,杨招伟,周涛,彭正良

• 1:中国三峡建工(集团)有限公司
• 2:长江水利委员会长江科学院水利部岩土力学与工程重点实验室
• 3:中国水利水电第十四工程局有限公司

摘要(Abstract)：

白鹤滩水电站尾水出口围堰拆除爆破具有工期紧、任务重、岩石条件复杂、近距离靠近保护物、水流冲渣要求高等突出特点。针对施工中的重难点，采取“分期分区分层”爆破拆除方案，将单个围堰分为“两期三层八区”,通过预留经济围堰，提前拆除水上部分等措施，克服了工程量大、工期紧的难题；采用“大直径钻机造孔、孔内套管护孔”的方式，有效减少了复杂地质条件下塌孔的产生，提高了施工工效也确保了爆破效果；“高单耗、低单响”的药量设计、“孔间分段、孔内延时”的爆破网路设计，即能满足近距离爆破条件下质点振速安全控制要求，又确保了爆后渣料块度满足水流冲渣条件。工程应用结果表明，最不利工况下爆破诱发质点峰值振速为11.85 cm/s,小于结构混凝土允许的安全控制标准12 cm/s;实测水击波峰值压力为0.12 MPa,小于水工钢闸门的安全允许控制值0.4 MPa;爆后绝大部分渣料块度粒径控制在40 cm以内，大块率控制在5%以内，爆破效果良好，满足水流冲渣条件。

关键词(KeyWords)： 围堰拆除;爆破设计;爆破施工;尾水出口;白鹤滩水电站

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金青年基金项目(52109148)

作者(Author): 吴发名,段兴平,徐进鹏,杨招伟,周涛,彭正良

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