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山西省定襄县戎家庄水电站从1977年开始挖掘引水隧洞。引水隧洞全长1378.3米,内径3.4米,洞轴向为北东34度,为门拱型有压隧洞。隧洞穿过的地层为太古界滹沱系绿泥石片岩,片理走向北西350度,倾向北东,倾角40—70度。该隧洞由进、出口二头掘进施工。当由出口位置向内掘至280米以后,遇有二条相距30米平行的扭张性断层,其产状与绿泥石片岩
Dingxiang County, Shanxi Province, Rongjiazhuang Hydropower Station from 1977 excavation diversion tunnel. The water diversion tunnel is 1378.3 meters in length with an inner diameter of 3.4 meters and the hole axis is 34 degrees north-east, which is a gate arch pressure tunnel. The tunnel through the stratum of the Archean Huan Tuo Department of chlorite schist, filming to 350 degrees northwest, north-easterly, dip 40-70 degrees. The tunnel by the import and export of two tunneling construction. When digging 280 meters inward from the exit location, there are two tensional faults parallel to each other at a distance of 30 meters. The occurrence is similar to that of chlorite schist