Bottom microarch-type gallery structure of HCRFD (High Core Rockfill Dam)

Abstract

The invention discloses a bottom microarch-type gallery structure of an HCRFD (High core Rockfill Dam) and relates to the field of water conservancy and hydropower engineering. The bottom microarch-type gallery structure is used for solving the problem that large dam safety is influenced by cracking and water leakage inevitably generated in a HCRFD on a bedrock. The adopted technical scheme is as follows: the bottom microarch-type gallery structure of the HCRFD comprises a gallery at the bottom of a core, and the top of the gallery is protruded upwards to be combined with the gallery so as to form a microarch structure, so that the force transferring route of the structure is changed by use of the microarch structure. Compared with a plateau type gallery structure, the microarch-type gallery structure has the characteristics that the increased concrete quantity is less, whereas the shear stress of a vertex angle region of the gallery can be obviously reduced; furthermore, the top shear stress region and bottom shear stress region of the gallery are provided with shear reinforcement structures, so that the stress characteristic of the gallery structure can be obviously improved, the risk that seepage failure occurs due to cracks caused by damage of shear stress at the top of the gallery is reduced, the problems of cracking and water leakage of the HCRFD on the bedrock are solved, the operation safety of a large dam is improved, and the economical efficiency of engineering is obviously improved.

Description

technical field [0001] The invention relates to a gallery structure at the bottom of a rockfill dam with a core wall on the bedrock in a water conservancy and hydropower project, in particular to a slightly arched gallery structure at the bottom of a rockfill dam with a core wall above the bedrock with a dam height of 200m or 300m. Background technique [0002] At present, the corridors at the bottom of the core rockfill dams built on the bedrock mostly adopt a flat-top corridor structure. There are no joints between the two sides and the concrete cover of the core wall, and the rigid connection is used. The main advantage is that the construction is simple and convenient. . For low dams (less than 100m in height), the shear stress at the four corners of the corridor is not obvious due to the small earth pressure on the top, which is generally within the shear strength range of concrete, and projects are often There will be no major problems. However, in recent years, my c...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a micro-arch corridor structure at the bottom of a high-core rockfill dam, which solves the problems that cracking and water leakage inevitably occur in the gallery at the bottom of the existing high-core rockfill dam, which affects the safe operation of the dam.

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