安哥拉凯凯水电站尾水1号隧洞开挖完成

Core Viewpoint - The successful completion of the last cycle of excavation for the tailwater No. 1 tunnel at the Kake Hydropower Station in Angola, constructed by China Energy Engineering Group Gezhouba Company, has been achieved 100 days ahead of schedule, marking a significant milestone in the project [1]. Group 1: Project Overview - The Kake Hydropower Station features two tailwater tunnels, each exceeding 5 kilometers in length, designed to transport water flow and discharge wastewater from the power generation units [3]. - The project involves a total excavation volume of over 470,000 cubic meters, utilizing a city gate-shaped tunnel cross-section of 16 meters by 16 meters, with a construction duration of approximately 29 months [5]. Group 2: Technological Innovations - The project team employed "dual-machine drilling and blasting" technology, enhancing drilling accuracy and blasting efficiency through collaborative operations of dual rock drilling rigs [6]. - The implementation of refined control over borehole layout, explosive quantity, and detonation sequence has resulted in a qualified over-excavation rate of over 90%, exceeding design requirements and minimizing secondary adjustment work [6]. Group 3: Economic Impact - Upon completion, the Kake Hydropower Station will have a total installed capacity of 2,172 megawatts and is expected to generate an average annual output of 8,566 gigawatt-hours [6]. - The construction peak is projected to provide over 6,000 jobs locally, significantly boosting the economic and social development of the region [6].