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尤羊峡水电站系黄河上游骨干工程之一,坝高178米,装机容量128万千瓦,坝后式厂房。水电站引水钢管直径φ7.5米,进入厂房前渐变为φ6.7米,斜穿过主厂房上游立墙进入水轮机层。上游立墙厚3米,墙长按机组段为23米,钢管斜穿时削弱墙体长度8.432米,挖空率达到36.6％。邻近钢管大孔洞右下侧为1.2米×2.2米的进入门洞,立墙下游跟部又有3米×3米的纵向廊道,如图1所示。因此在立墙下部大孔洞附近,孔口纵横布置,
Youyang Gorge Hydropower Station is one of the key projects in the upper reaches of the Yellow River, with a height of 178 meters and an installed capacity of 1.28 million kilowatts. Hydropower station water pipe diameter of φ7.5 meters, into the factory before the gradient of φ6.7 meters, oblique through the main building upstream wall into the turbine layer. Upstream wall thickness of 3 meters, the wall length of 23 meters long by the machine section, weave through the wall when weakened the wall length of 8.432 meters, hollowing rate of 36.6%. Adjacent to the lower right side of the big hole in the steel pipe is a 1.2 m × 2.2 m entrance doorway. There is another 3 m × 3 m vertical corridor downstream of the wall, as shown in Figure 1. Therefore, the wall in the lower part of the large hole near the hole vertical and horizontal layout,