High-geostress narrow-valley inverted arch plunge pool and design method thereof

Abstract

The invention belongs to a concentrated flood discharge and energy dissipation structure behind a hydroelectric dam, and more particularly relates to a high-geostress narrow-valley inverted arch plunge pool and a design method thereof. The plunge pool is structurally characterized by comprising a bottom plate (1), arch supports (2) and anchor bar piles (3), wherein the bottom plate (1) is an arched concrete structure on the whole, and two ends of the arched concrete bottom plate (1) is connected with the arch supports (2) into a whole; the anchor bar piles (3) are arranged at the lower end ofthe arched concrete bottom plate (1) at intervals, and each anchor bar pile (3) keeps perpendicular to the lower end of the bottom plate (1); and the arch supports (2) at the two ends are positioned at the lower ends of protection slopes (9) at the two ends. The design method is completed by five steps, makes full use of the natural 'pan bottom'-shaped river beds, avoids touching geostress concentration areas at the bottom of the valley due to trapezoid excavation, and adopts the inverted arch structure to finally transfer most of load to rock mass through the arch supports instead of bearingall the load by the river beds, thus improving the stress concentration phenomenon at the bottom of the valley.

Description

technical field [0001] The invention belongs to a centralized flood discharge and energy dissipation structure behind a dam of a hydropower station, in particular to an anti-arch pad pond and a design method for a narrow river valley with high ground stress. Background technique [0002] Appropriate energy dissipation and anti-scour facilities must be adopted in the downstream of the discharge structure to prevent the water flowing over the dam from scouring the downstream riverbed and endangering the safety of the hub structure and bank slope. The water cushion pond is one of the commonly used energy dissipation and anti-scour facilities for arch dams, especially high arch dams. The water cushion pond is combined with the slope protection on both banks and the downstream second dam to form sufficient width, depth and length of the water cushion to ensure the flow at all levels When it is discharged, the water flow can form a submerged hydraulic jump, so as to ensure that th...

AI Technical Summary

Problems solved by technology

For the "V"-shaped terrain of the natural channel of the dam site, the slopes on both banks are steep, the channel is narrow, and the bottom of the valley is in a relatively high in-situ stress environment field. The stress concentration area at the bottom of the valley, and it is difficult to ensure the safety and durability of the structure

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