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燕山水库输水洞采用下部先爆全断面爆破开挖法和装载机倒行出碴法,取得了很好的施工效果,解决了小断面隧洞爆破进尺慢、出碴困难、经济效益差的问题。
The Yanshan Reservoir water diversion tunnel adopts the method of excavation of the lower part of the first full blasting excavation and the ballast backcounter of the loader to obtain good construction effects and solves the problems of slow footage blasting, ballasting difficulties and poor economic benefits of the small section tunnel blasting .