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 PhaseⅡDiversion Upper Horizontal Adit of Meizhou Pumped Storage Power Station on Accident Gate

作　　者：郑晶星 黄文锋 陈明[2] 陈光泽 潘鑫豪 郑建月 ZHENG Jing-xing;HUANG Wen-feng;CHEN Ming;CHEN Guang-ze;PAN Xin-hao;ZHENG Jian-yue(Engineering Construction Management Branch of the China Southern Power Grid Peak and Frequency Modulation Power Generation Co.,LTD,Guangzhou 511402,China;State Key Laboratory of Water Resources Engineering and Management,Wuhan University,Wuhan 430072,China)

机构地区：[1]南方电网调峰调频发电有限公司工程建设管理分公司,广州511402 [2]武汉大学水资源工程与调度全国重点实验室,武汉430072

出　　处：《爆破》2024年第2期177-184,共8页Blasting

基　　金：国家自然科学基金项目(51979205)。

摘　　要：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。Air overpressure generated from the blasting excavation may affect the safety of surrounding structures.The blasting operation area of the horizontal tunnel of the second phase of Meizhou Pumped storage power station is only 81 m away from the steel accident gate of the upper drainage tunnel of the second phase project,which has been built and put into the operation in the first phase.However,the blasting may affect the operation stable of the accident gate.Therefore,taking the blasting excavation of the horizontal hole above the water diversion of the second phase of Meizhou pumped storage power station as the object,the field monitoring of blasting air overpressure was carried out.The distribution rule of blasting air overpressure and its influence on the safety of the emergency gate in the upper reservoir of Meizhou pumped storage power station were analyzed,which provided support for analyzing the influence of blasting air overpressure on the safety of the emergency gate in the upper reservoir.The blasting air overpressure monitoring data show that the air overpressure level in front of the accident gate about 80 m away from the blasting master surface is distributed at 0.63~3.46 kPa,which is much smaller than the suggested corresponding blasting safety control standard of 100 kPa.The protective facilities before the gate can effectively reduce the air overpressure at the gate position,and the measured air overpressure in the fourth and fifth blasting is reduced by more than 55%.When the single and total charge volume are effectively controlled,the measured air overpressure value is much smaller than the suggested control standard value.Besides,there is no abnormality in the field macro investigation and other detection data,the blasting construction does not affect the safe operation of the accident gate on the reservoir.

关 键 词：爆破开挖 空气超压 事故闸门 安全影响 现场测试 

分 类 号：TD235.3[矿业工程—矿井建设]