Design method of anti-seepage body for high concrete face rockfill dam with deep overburden in narrow channel

Abstract

The invention provides a design method of a high-face rockfill dam anti-seepage body on a deep covering layer in a narrow river channel. The method comprises the following steps of: (1) locally excavating the deep covering layer in the narrow river channel, arranging a gravity type arch dam at the narrow river channel, and sharing the load on the arch dam by bed rocks at the two ends of the riverchannel; (2) paving a toe board with the same width as a platform on the top platform of the gravity type arch dam, connecting the toe board with an upper face of the high-face rockfill dam through aconnecting seam, and arranging two water stops; and (3) backfilling the upstream side of the gravity type arch dam of the excavated river channel by using gelled sand gravels so as to ensure the stability and safety of the gravity type arch dam in a dam body filling period. The deformation resistance of the anti-seepage body can be improved, and the method is suitable for face plate rockfill dam engineering of irregular face plate and toe plate pulling and pressing damage and connecting seam damage caused by large deformation of a deep covering layer in a narrow river channel.

Description

technical field [0001] The invention relates to the anti-deformation field of an anti-seepage body, in particular to a design method for an anti-seepage body of a high face rockfill dam on a deep and thick covering layer in a narrow river channel. Background technique [0002] With the in-depth development and utilization of water conservancy energy, limited by the topography and geological conditions, some face rockfill dams need to be arranged on a narrow river channel with a width of 50-100m in the center of the valley, and there is a sand and gravel layer of 20-50m in the river channel. The design and safety of anti-seepage systems have attracted much attention. [0003] At the present stage, there are mainly two methods for the design of the anti-seepage body of the face rockfill dam under the above dam site conditions. One is to use large excavation to remove the overburden soil in the area of ​​the plinth, and place the plinth directly on the bedrock. However, under ...

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Problems solved by technology

One is to use large excavation to remove the overburden soil in the area of ​​the plinth, and place the plinth directly on the bedrock. However, under this design scheme, the structural design of the anti-seepage panel, plinth, and peripheral joints in the anti-seepage system is complicated , the X-ray of the plinth is extremely irregular, prone to breakage of the panel and damage to the anti-seepage body caused by large deformation of the connection joint in the area with a large slope change

Another method is to combine the anti-seepage wall and arrange the toe board directly on the soft covering layer. Although the arrangement is simple, it is easy to cause the connection between the toe board, the connecting board and the anti-seepage wall due to excessive deformation of the covering layer. The damage of the seam will cause the damage of the anti-seepage body

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