Flood discharge and energy dissipation structure for high flow ratenon-pressure tunnel

Abstract

The invention discloses a flood discharge and energy dissipation structure for a highflow rate non-pressure tunnel. The flood discharge and energy dissipation structure for the highflow rate non-pressure tunnelsequentially comprises a connecting section, a discharge chute, a stilling pool, and an energy dissipation tail sill, wherein the connecting section is located at the exit of the non-pressure tunnel and with a rectangular cross section, a sudden expansion drop sill is arranged at the outlet of the connecting section, the discharge chute is a diffused twisted surface discharge chute, the cross section of the discharge chute is trapezoidal, the bottom plate of the discharge chute is of a diffused structure, the side wall of the discharge chute is a twisted surface, and the bottom plate of the discharge chute is a slope and connected withthe sudden expansion drop sill at the upstream, the bottom plate of the stilling pool is a flat bottom plate, the tail end is provided with an energy dissipation tail sill, and the crosssection of the stilling pool is trapezoidal. Topography and geological conditions can be fully utilized to ensure safety and stability of the structure, while the amount of excavation is reduced and the excavation slope is reduced, the length of the stilling pool is decreased, the space energy dissipation area is enlarged, the energy dissipation efficiency is improved to the maximize extent,the water flow state is improved, cavitation and wearing are prevented, and the engineering investment is lowered.

Description

technical field [0001] The invention relates to a water discharge and energy dissipation structure for water conservancy and hydropower projects, in particular to a flood discharge and energy dissipation structure for a high-velocity non-pressure tunnel. Background technique [0002] The water discharged through the discharge structure often has a very high flow rate, which has obvious destructive power to the downstream river bed. Therefore, in water conservancy and hydropower projects, discharge and energy dissipation structures must be installed to eliminate the huge energy of the discharge flow and ensure The safety of the downstream riverbed and the drainage structure itself. Stilling pool is a common bottom flow energy dissipation structure, which is widely used in water conservancy and hydropower projects. [0003] Generally, the stilling pool adopts an equal-width rectangular section. The length and depth of the pool should ensure that the water flow forms a stable ...

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Problems solved by technology

[0004] When the discharge flow is large and the flow velocity at the end of the steep trough is high, the depth and length of the stilling basin are required to be large. For places with limited topographic and geological conditions, the layout requirements of the stilling basin cannot be met, and other auxiliary energy dissipation is required Only the layout of the auxiliary energy dissipation work can meet the energy dissipation requirements, and the construction of the auxiliary energy dissipation work is more difficult. Once the construction control is not good, the auxiliary energy dissipation work will be damaged during the operation period.

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