有压引水发电隧洞经济技术因素选择研究

Study on selection of economic and technical factors of pressure water diversion tunnel

针对长距离和投资较大的水电站有压引水发电隧洞,洞径和衬砌型式是隧洞经济技术合理性的关键因素。对隧洞洞径、衬砌型式等进行了选择,计算分析结果表明:洞径4.2 m的各项电能指标较优,隧洞内流速合理,净现值最大,补充单位电能投资最接近电站本身单位电能投资,因此,隧洞洞径4.2 m为最经济的洞径。在各种工况下,通过理正岩土5.1程序进行隧洞结构计算,隧洞结构尺寸满足混凝土规范的强度和抗裂稳定要求,因此引水发电隧洞衬砌型式是合理的。

Aiming at the long distance and greater investment of hydropower station pressure diversion tunnel,tunnel diameter and lining type are the key factors of the rationality of the economic and technological rationality of the tunnel.Through the tunnel diameter and lining type selection and calculation,the results showed that：the electric energy index of the tunnel diameter 4.2 m is superior,the flow rate in the tunnel is reasonable,the net present value is the largest,and the supplementary unit electric energy investment is the closest to the power station itself.Therefore,the 4.2 m tunnel diameter is the most economical.In a variety of conditions of tunnel structure calculation by Lizheng soil 5.1,the structure and size of tunnel has met the requirements of strength and anti crack stability of concrete,so it is reasonable for lining type of diversion tunnel,which has the reference significance for similar engineering design.