极强岩爆条件下开敞式TBM施工措施探讨与应用

每一台隧道掘进机（TBM）都是针对一定的地质条件设计制造的,其针对性强、通用性较差,在不良地质条件下,既需要TBM设备配置具有适应性,又必须采取适当的施工措施。结合锦屏二级电站引水隧洞TBM施工实践中遇到的大埋深、高地应力、极强岩爆的地质条件,研究了加强初期支护、岩面喷水、应力释放孔、应力释放导洞等解决措施,并付诸实施,取得了较好的应用效果,可为类似工程提供参考。

An Exploration into and the Application of Construction Measures to the Open-Type TBM Under the Conditions of Extremely Serious Rock Burst

Each tunnel-boring machine（TBM） is designed and made especially for certain geological conditions,in which case it is strong in dealing with certain geological conditions but poor in universality.Under poor geological conditions,it is necessary not only for the allocation of the TBM equipment to have good adaptability but also for proper construction measures to be taken.With the TBM construction practice of the water-leading tunnel of the second-stage power station at Jinping as a practical example,which is conducted under the geological conditions of being deeply buried,high in geological stress and extremely serious in rock burst,discussed in the paper are such solutions as strengthening the initial support,spraying water over the rock surface,boring stress-releasing holes,digging stress-releasing guide shafts,etc.All those above-mentioned construction measures are put into practice and achieves fairly good application results.The paper may serve as a useful reference for other projects of similar types.