The diversion tunnel section excavated by tunneller is buried deeply, the under ground water level is high, the activities of underground water is lively, and Karst topography is quite developed.
采用掘进机开挖的引水隧洞洞段埋藏较深，地下水位高，地下水活动强烈，岩爆频繁，岩溶较为发育。
Tunnel in hard rock may be excavated in whole section by using chiseling rock trolley to drill small holes.
在硬岩中中隧道可采用凿岩台车钻眼，进行全断面开挖。
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