梅蓄电站二期上引水洞爆破开挖诱发空气超压对上库事故闸门的影响分析Influence of Air Overpressure induced by Blasting Excavation of Phase Ⅱ Diversion Upper Horizontal Adit of Meizhou Pumped Storage Power Station on Accident Gate
郑晶星,黄文锋,陈明,陈光泽,潘鑫豪,郑建月
摘要(Abstract):
爆破开挖过程中产生的空气超压可能会影响周边建构筑物的安全。梅州抽水蓄能电站二期引水平洞的爆破作业区,距离在一期工程中已建好并投入运行的二期工程引水上平洞上库钢质事故闸门仅81 m,爆破作业可能会影响事故闸门的稳定运行。为此,以梅州抽水蓄能电站二期引水上平洞的爆破开挖为对象,开展了爆破空气超压现场监测工作,分析了爆破空气超压的分布规律及其对梅州抽水蓄能电站上库事故闸门的安全影响,为分析爆破空气超压对上库事故闸门的安全影响提供了支撑。现场的爆破空气超压监测数据表明:距离爆破掌子面约80 m的事故闸门前的空气超压水平分布在0.63~3.46 kPa,远小于建议的相应的爆破安全控制标准100 kPa;闸门前使用胶帘等防护设施可以有效减小闸门位置的空气超压,实测的第4次和第5次爆破空气超压减小了55%以上;单段装药量及总装药量得到有效控制时,实测的空气超压值远低于建议的控制标准;现场宏观调查及其他检测数据也未见异常,爆破施工未影响上库事故闸门的安全运行。
关键词(KeyWords): 爆破开挖;空气超压;事故闸门;安全影响;现场测试
基金项目(Foundation): 国家自然科学基金项目(51979205)~~
作者(Author): 郑晶星,黄文锋,陈明,陈光泽,潘鑫豪,郑建月
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