南公1水电站溢洪道保护层开挖孔底消能-聚能结构优选研究  

Study on Optimization of Dissipation-accumulation Energy Structure at Bottom of Borehole during Protective Layer Excavation of Namkong 1 Hydropower Station

作　　者：陈育权 刘广鑫[2,3] 柯昌佳 卢文波 刘志鹏[1] 赵栋 陈明 CHEN Yu-quan;LIU Guang-xin;KE Chang-jia;LU Wen-bo;LIU Zhi-peng;ZHAO Dong;CHEN Ming(China International Water&Electric Corp,Beijing 100120,China;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering,Ministry of Education,Wuhan University,Wuhan 430072,China)

机构地区：[1]中国水利电力对外有限公司,北京100120 [2]武汉大学水资源与工程科学国家重点实验室,武汉430072 [3]武汉大学水工岩石力学教育部重点实验室,武汉430072

出　　处：《爆破》2020年第4期10-17,共8页Blasting

基　　金：国家自然科学基金面上项目(51779190,51979205)。

摘　　要：岩石基础的开挖成型质量对工程建设及运行安全有着重要影响。基于老挝南公1水电站溢洪道保护层开挖,在现场开展了不同消能-聚能结构的爆破试验,结合试验数据研究了孔底不同消能-聚能结构对开挖成型效果的影响。结果表明:相较于“铁精粉+松砂垫层”的消能-聚能结构,“铁球+松砂垫层”的消能-聚能结构能够获得更加平整的建基面;“铁精粉+松砂垫层”的消能-聚能结构则能够更有效地缓冲消耗传递至孔底的爆炸能量,更好地保护孔底岩体。综合开挖成型效果和残孔破坏分析结果,现场优选了“铁球+松砂垫层”的消能-聚能结构,并在一级消力池的保护层开挖中推广了消能-聚能联合控制爆破技术,取得了良好的开挖成型效果。The excavation shaping quality of rock foundation exerts a profound impact on the project construction and operation safety.Different blasting experiments of dissipation-accumulation energy structures at the bottom of boreholes were carried out during the excavation of the spillway protective layer of Namkong 1 Hydropower Station in Laos.The influence of the structures on the shaping effect was studied by the experimental data.The results show that the "iron ball+loose sand cushion" dissipation-accumulation energy structure can obtain a flatter foundation surface than that of the "iron powder+loose sand cushion" structure.However,the technology of dissipation-accumulation energy on iron powder and loose sand cushion′ structure can effectively buffer the explosive energy which is transmitted to the bottom of the borehole so that to protect the rock mass.Based on the analysis results of shaping effect and residual hole damage,the iron ball and loose sand cushion′ structure was selected.Furthermore,this controlled blasting technology by dissipation-accumulation energy was also applied in the excavation of the protective layer of the first-level stilling basin,achieving a good excavation shaping effect.

关 键 词：消能-聚能结构 岩石基础 爆破试验 开挖成型效果 

分 类 号：TD235.3[矿业工程—矿井建设]