陡坡隧洞不同进口形式的水力特性分析  

Hydraulic Characteristics of Different Inlet Types of Steep Slope Tunnel

作　　者：李蘅 李学海[2] 杜泽金 

机构地区：[1]长江勘测规划设计研究有限责任公司,武汉430010 [2]长江科学院水力学研究所,武汉430010

出　　处：《长江科学院院报》2014年第1期38-41,共4页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金面上资助项目(51279014)

摘　　要：为研究陡坡隧洞的泄流能力和洞内水流流态等水力特性与隧洞进口形式的关系,以某水电工程支流导流陡坡长隧洞为例,运用水力计算分析和模型试验验证的方法,分析比较了锐缘进口和曲线进口形式对陡坡隧洞泄流能力和流态的影响。研究表明:采用曲线进口形式可以提高泄流能力,降低围堰高程,但设计工况下洞内流态处于明满交替流状态,不利隧洞结构安全;采用锐缘进口形式,泄流能力有所降低,但可避免洞内出现明满交替流状态。综合比较认为,在围堰规模较小时,设计陡坡隧洞采用锐缘进口更为合理。The effect of sharp-edge inlet and curved inlet on the discharge capacity and flow regime of steep tunnel is researched by using hydraulic calculation analysis and model test verification.The long steep diversion tunnel of a hydropower project is taken as the research object.Research shows that curved inlet could increase the discharge capacity and reduce the cofferdam height,but brings about free-surface-pressure flow in the tunnel,which is harmful to the safety of tunnel structure; whereas sharp-edge inlet reduces the discharge capacity,but avoids free-surface-pressure flow.Therefore,when the cofferdam scale of hydropower project is small,the sharp-edge inlet is recommended.

关 键 词：陡坡隧洞 进口形式 水力计算 试验验证 

分 类 号：TV135[水利工程—水力学及河流动力学]