锦屏二级水电站引水隧洞工程强岩爆综合防治措施研究
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摘要
锦屏二级引水隧洞工程一般埋深1 500~2 000 m,最大埋深2 525 m,具备发生强至极强岩爆的条件,工程开工以来已发生多次强岩爆。为最大限度降低强岩爆对工程安全和进度的影响,结合辅助洞和排水洞的施工经验,锦屏二级引水隧洞工程采用了微震监测、应力爆破解除、中空预应力注浆锚杆、水涨式锚杆、纳米仿钢纤维混凝土等综合防治措施。这些措施的综合运用在水电和交通隧道工程领域尚属首次,并已取得一定成果。
The buried depths of the diversion tunnels for Jinping Hydropower Station II are usually 1 500~ 2 000 m with the maximum depth of 2 525 m,therefore,the tunnels have to be excavated under the conditions of possible heavy rockbursts and a number of rockbursts have been actually happened therein since the start of the excavations.In order to lower the impact from rockburst on safety and progress of construction maximally,the control measures such as micro-seismic monitoring,blasting stress relieving,pre-stressed hollow pouring anchor rod,water swelling anchor rod,steel-wire-like nano-fiber concrete,etc.are adopted during the construction of the tunnels in accordance with the experiences from the construction of the auxiliary tunnel and discharge tunnel.All the measures are not only comprehensively applied to the areas of hydropower and traffic development projects for the first time,but certain achievements from them are also obtained.
The buried depths of the diversion tunnels for Jinping Hydropower Station II are usually 1 500~ 2 000 m with the maximum depth of 2 525 m,therefore,the tunnels have to be excavated under the conditions of possible heavy rockbursts and a number of rockbursts have been actually happened therein since the start of the excavations.In order to lower the impact from rockburst on safety and progress of construction maximally,the control measures such as micro-seismic monitoring,blasting stress relieving,pre-stressed hollow pouring anchor rod,water swelling anchor rod,steel-wire-like nano-fiber concrete,etc.are adopted during the construction of the tunnels in accordance with the experiences from the construction of the auxiliary tunnel and discharge tunnel.All the measures are not only comprehensively applied to the areas of hydropower and traffic development projects for the first time,but certain achievements from them are also obtained.
引文
[1]朱焕春,朱永生.锦屏二级水电站辅助洞岩爆与控制研究和实践成果报告[R].上海:华东勘测设计院.
[2]侯靖,周春宏,李军.锦屏二级水电站引水隧洞施工岩爆防治方案与措施专题报告[R].上海:华东勘测设计院.
[3]赵向东,陈波,姜福兴.微地震工程应用研究[J].岩石力学与工程学报,2002(12):2609-2612.
[2]侯靖,周春宏,李军.锦屏二级水电站引水隧洞施工岩爆防治方案与措施专题报告[R].上海:华东勘测设计院.
[3]赵向东,陈波,姜福兴.微地震工程应用研究[J].岩石力学与工程学报,2002(12):2609-2612.
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