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研究目的:从实验及理论角度阐述边坡高扬程虹吸排水容易断流造成虹吸中断的原因,并提供解决方案,实现虹吸排水的长期有效。创新要点:利用物理模型实验,结合理论解析推导,得到了高扬程虹吸排水管顶部流态特征及其与管径的关系,解决了高扬程虹吸排水容易断流造成虹吸中断问题,保证了虹吸排水技术在边坡治理工程中的长期有效性。研究方法:通过物理模型试验,揭示虹吸水流经过管顶区段的三种流型特征(见图4);利用热力学理论推导,得到了虹吸水流经过管顶区段由贴壁流向弹状流转变的临界管径,见公式(23)。重要结论:管中形成气液共同移动的完整弹状流是实现虹吸排水长期稳定的关键,虹吸水流经过管顶区段由贴壁流向弹状流转变时存在临界管径。保证边坡工程中虹吸排水长期稳定的管径以3.6 mm为宜。
The purpose of this study is to describe the reasons for the siphon interruption caused by the siphon and drainage of high-lift slopes and to provide solutions to achieve the long-term effectiveness of siphon drainage from the experimental and theoretical perspective. Innovative points: The use of physical model experiments, combined with the theoretical analysis of the derived high-head siphon drainage flow characteristics of the top and its relationship with the diameter of the pipe to solve the high-lift siphon drainage interrupted siphon easily interrupted siphon to ensure siphon drainage Long Term Effectiveness of Technology in Slope Treatment Engineering. Research methods: Through the physical model test, three types of flow characteristics of the siphon water flow through the top of the pipe are revealed (see Figure 4). Based on the thermodynamic theory, the siphon water flow passing through the top of the pipe is changed from the wall flow to the slug flow The critical diameter, see equation (23). Important conclusion: The formation of a complete slug flow of gas and liquid moving together in the pipe is the key to achieve long-term stability of siphon drainage. There is a critical diameter when the siphon flow passes through the pipe top section from adherent wall to slug flow. Siphon drainage project to ensure long-term stability of the pipe diameter to 3.6 mm is appropriate.