针对下坝水库地形地貌、地质条件较复杂，受裂隙切割岩体较破碎，岩体强风化带完整性较差，易形成滑坡、崩塌、偏压、泥石流等问题，经现场踏勘，结合《水工隧洞建筑物设计规范》（SL386-2007），（SL279-2002）等，综合考虑工程占地、施工难度及工程投资等因素，优选“利用导流隧洞改为有压取水／放空隧洞”的一洞三用取放水方案。经水力计算、隧洞衬砌计算、应力稳定性复核等论证分析，隧洞建筑物结构、过流能力、衬砌裂缝宽度和稳定性等均满足规范要求，优化设计方案具有较高的技术可行性和经济合理性。%Aiming at the complex topography and geological conditions , the mass fractured rock by fissures cutting, the poor integrity of strong weathering zone which is easy to form landslides, collapse, unsymmet-rical pressure, debris flow and other problems in Xiaba reservoir, after the reconnaissance trip, combined with (SL386-2007), (SL279-2002),this paper takes overall consideration the engineering land occupation , the construction difficulty and the engineering invest-ment and other factors, optimal chooses the water intake and drainage scheme of reconstruction the diver-sion tunnel as the pressurized water taking/venting tunnel which can realize three function by one tunnel. From the hydraulic calculation, the tunnel lining calculation, the stress stability check and others analy-sis, the results showed that the structure, flow capacity, crack width and stress stability of the tunnel buildings can meet the standards requirements and the optimization design scheme has higher technical feasibility and economic rationality.
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