24.8 km输水隧洞工程是厄瓜多尔CCS水电站工程控制工期的关键项目，由2台双护盾TBM施工。从工程概念设计、基本设计、详细设计直至现场施工，设计工程师转变依照规范进行工程设计的传统设计模式，分析梳理原设计方案，依据工程合同、工程地质及水文地质、现场施工环境条件及其变化等，并结合TBM施工隧洞工程技术特点，将TBM设备特性和TBM施工技术高度融合于隧洞工程设计中，对输水隧洞设计方案、隧洞施工规划方案及TBM管片类型等进行全过程动态优化设计，为TBM快速掘进，高效成洞，安全、环保施工提供便利的隧洞设计施工方案。该方案的实施，能保证CCS水电站工程质量和工期， 并有效控制EPC模式下的CCS水电站工程投资。

The 24.8 km headrace tunnel is the key to CCS Hydropower Station project in Ecuador, which is constructed by two doubleshield TBM. The traditional design modes of engineering concept design, basic design, detailed design and site construction are modified and improved; and the original design scheme is analyzed. The equipment characteristics and the construction technology of TBM are highly integrated into the tunnel engineering design based on engineering contract, engineering geology and hydrogeology, site construction environment conditions and its changes, and the technical characteristics of TBM construction tunnel engineering. The whole process dynamic optimization design is carried out for design scheme of the headrace tunnel, the construction planning scheme of tunnel and the type selection of TBM segments, so as to provide rational tunnel design and construction scheme for rapid and efficient TBM tunneling, safety and environmental protection construction. The implementation of the scheme can ensure the quality and construction schedule of CCS Hydropower Station, and effectively control the investment of CCS Hydropower Station under EPC mode.