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四、发电站地下厂房洞室的施工今市发电站的地下厂房位于日光山脉东端月山南坡地下400米深处,离下游水库的水平距离为600米。地下厂房周围地质主要是古生代的砂岩、粘板岩经中生代末到古第三纪火山活动,岩浆渗入再结晶而成的硅质砂岩或角砾岩以及受热水变质作用而成的角页岩,都是坚硬岩石。在地下厂房洞室周围有几个10～50厘米宽的小规模破碎带,但不存在与洞室主体交错的连续性破碎带,岩石水密性很高,几乎不存在渗水现象。基岩等级大部为 C_H～B 级,局部为 C_H 级。
Fourth, the underground power station construction caverns Today’s power station underground power plant is located in the eastern end of the sun light mountains south of the Yushan 400 meters underground, horizontal distance from the downstream reservoir of 600 meters. Geology around the underground powerhouse is dominated by Paleozoic sandstone. The clay slate, which was formed through the end of the Mesozoic Era to the Paleo-Tertiary volcano, was intrusive and recrystallized into siliceous sandstone or breccia, and angular shale, It is hard rock. There are several small-scale crushed bands 10 to 50 centimeters wide around the caverns in the underground factory buildings, but there is no continuous crushing zone interleaved with the main body of the cavern. The rock is very watertight with almost no seepage. Most of the bedrock grades are C_H ~ B grades and some are C_H grades.