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二滩电站5号与7号公路隧洞均为三心圆型断面,断面尺寸为10×7m(宽×高)。这两条公路隧洞的交叉口系一在平面上以圆弧相交的三岔口,距地表约200m,岩体为较完整的新鲜玄武岩,但有两条宽度3～5cm的小断层在这里相交。在设计过程中,经过方案比较和详细的分析论证后,决定采用锚喷支护,放弃了常用的钢筋混凝土衬砌支护方式。其突出的优点是:开挖轮廓不复杂、结构简单、施工简便进度快、节省工程量造价低。这项工程由我院二滩处设计,铁
Ertan Hydropower Station No.5 and No.7 highway tunnels are all three-hearted round cross-section, section size of 10 × 7m (width × height). The intersection of the two road tunnels is a three-way intersection with arcs in the plane, about 200m above the earth’s surface. The rock mass is a relatively complete fresh basalt, but two small faults with widths of 3 to 5cm intersect here. In the design process, after the program comparison and detailed analysis and demonstration, decided to adopt the anchor spray support, abandoned the commonly used reinforced concrete lining support. Its outstanding advantages are: Excavation profile is not complicated, simple structure, the construction is simple and fast progress, saving the project cost is low. This project by our hospital two beach design, iron