Research on the Hydraulic Transients of Free-surface-pressure Flow in Rectangular Tunnel with Arch Crowns

JU Cheng , JU Xiao-ming, SUN Li-cheng

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China Rural Water and Hydropower ›› 2018 ›› (10) : 92-95.

Research on the Hydraulic Transients of Free-surface-pressure Flow in Rectangular Tunnel with Arch Crowns

  • JU Cheng1 ,JU Xiao-ming1,2 ,SUN Li-cheng1
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Abstract

Transient calculation results were carried out on free-surface-pressure flow in rectangular tunnel with arch crown by Preissmann slot method. Parameters and formulas of this type tunnel on hydraulic transient research were given. An applied engineering practice proved that a significant pressure suddenly occurred on the top of the tunnel while water occupied the section inside the tunnel from free flow to closed flow and a little pressure changing exists from closed flow to free flow,without considering the air volume on the arch crown air chamber. The more quickly of flow discharge variation,the more intense of the pressure changing is. The closer the tunnel section is to the position of flow discharge variation,the huger pressure of hydraulic transient is.

Key words

rectangular tunnel with arch crown / free-surface-pressure flow / hydraulic transient

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JU Cheng , JU Xiao-ming, SUN Li-cheng. Research on the Hydraulic Transients of Free-surface-pressure Flow in Rectangular Tunnel with Arch Crowns. China Rural Water and Hydropower. 2018, 0(10): 92-95

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