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萝卜岗隧道为四川省瀑布沟水电站复建工程G108线控制性工程,全长1560米,2007年初开工,目前仍在施工之中。岩爆为岩体中聚积的弹性变形能在地下工程开挖中突然猛烈释放,使岩石爆裂并弹射出来的现象。发生岩爆的原因是岩体中有较高的地应力,并且超过了岩石本身的强度,同时岩石具有较高的脆性度和弹性。这时一旦地下工程破坏了岩体的平衡,强大的能量把岩石破坏,并将破碎岩石抛出。本文先描述了萝卜岗隧道岩爆段上半断面施工的过程,后对其特殊地质情况作了分析。
The Luobogang Tunnel is the G108 line control project for the reconstruction of the Pubugou Hydropower Station in Sichuan Province. It has a total length of 1,560 meters and started operation in early 2007 and is still under construction. Rock burst is the elastic deformation accumulated in the rock mass which can suddenly and violently release during excavation of underground engineering, causing the rock to burst and eject. Rockburst occurs because of the higher in-situ stress in the rock mass, which exceeds the strength of the rock itself, while the rock has high brittleness and elasticity. At this moment, once the underground engineering destroys the balance of the rock mass, the powerful energy destroys the rock and throws the broken rock. This article first describes the process of construction of the upper section of the rock burst section of the Luobagang tunnel and analyzes the special geological conditions.