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

A technology of rockfill dams and high core walls, applied in the field of micro-arch corridor structures at the bottom of the dam, can solve problems such as corridor cracking, water leakage, and affecting the safe operation of the dam, so as to reduce shear stress and improve mechanical characteristics , The effect of reducing the risk of penetration damage

Active Publication Date: 2017-01-25
POWERCHINA CHENGDU ENG
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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 a

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

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with accompanying drawing.

[0020] Such as figure 1 As shown, the micro-arch corridor structure at the bottom of the high core wall rockfill dam of the present invention includes the corridor 1 at the bottom of the core wall 4, and the bottom of the corridor 1 is a backing plate 12 of concrete. In order to ensure safety requirements, the backing plate 12 The backing plate thickness h2 should be greater than or equal to 2.0m. Below the backing plate 12 is the bedrock 5, and the excavation line of the bedrock 5, that is, the excavation boundary line, is in the shape of an inverted isosceles trapezoid. The top of the corridor 1 protrudes upwards and combines with the corridor to form a micro-arch structure 11, and the height h1 of the convex part of the top of the micro-arch structure 11 is preferably 0.8m-1.2m. Both the gallery 1 and the micro-arch structure 11 are centered on the dam axis 6, and the ...

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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...

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Application Information

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IPC IPC(8): E02B7/06
CPCE02B7/06
Inventor 张元泽余挺金伟张琦王晓东
Owner POWERCHINA CHENGDU ENG
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