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升钟水库位于嘉凌江支流西河上,是一座以灌溉为主的水利枢纽,库容13.4亿米~3。放空隧洞位于左岸,洞长405.0米,衬砌后直径8米。施工初期用以导流;正常运行时作放空水库用;在非常情况下,则协助溢洪道宣泄超标准洪水,隧洞进口及竖井等设置详见图1。 隧洞从1977年12月分进、出口两个工作面掘进,于1978年4月底贯通。施工中采用台阶法、光面爆破掘讲,锚、喷支
Ascent Reservoir is located in the Jiahe River tributary of the West River, is an irrigation-based water conservancy hub, storage capacity of 1.34 billion meters ~ 3. The empty tunnel is located on the left bank with a length of 405.0 meters and a lining diameter of 8 meters. In the early stage of construction, it is used to divert water. In normal operation, it is used for emptying reservoirs. In exceptional circumstances, it assists spillway to release excessive standard floodwater. See Figure 1 for detailed settings of tunnel entrance and shaft. The tunnel was subdivided into two sections in December 1977, with two working faces dug out and opened at the end of April 1978. Construction using the step method, smooth blast excavation, anchor, spray branch