Stage construction method for perpendicular anti-seepage structure of toe boards of concrete faced rockfill dam

Abstract

The invention relates to a stage construction method for a perpendicular anti-seepage structure of toe boards of a concrete faced rockfill dam. The stage construction method aims at solving the problem of cross interference of construction periods of the toe boards and an anti-seepage wall, and the time limit for a project is effectively shortened. According to the technical scheme, the anti-seepage structure is arranged on coverage layer foundations with high water permeability or bed rock with the high permeable rate and poor groutability; and the anti-seepage structure comprises the first-stage toe boards, the second-stage toe boards, the concrete anti-seepage wall and a grouting curtain. The construction method includes the following steps that (1) the first-stage toe boards on the upstream and the downstream of the concrete anti-seepage wall are constructed, T-shaped anti-seepage wall slots are reserved in the middles of the first-stage toe boards, and meanwhile joint bars are embedded on the first-stage toe boards; (2) the concrete anti-seepage wall is constructed, and curtain grouting pipes are embedded inside the concrete anti-seepage wall; (3) scabbling is carried out on concrete on the surfaces of the first-stage toe boards, the T-shaped second-stage toe boards are poured at the top of the concrete anti-seepage wall, and structure seams ranging from 5 cm to 10 cm are reserved between the second-stage toe boards and the top face of the concrete anti-seepage wall; and (4) the grouting curtain is constructed through the curtain grouting pipes embedded into the concrete anti-seepage wall.

Description

technical field [0001] The invention relates to a staged construction method for the vertical anti-seepage structure of the toe slab of a face rockfill dam, which is suitable for construction under the basic geological conditions of the overburden or the fully and strongly weathered rock (such as soft rock) with high water permeability and poor irrigated property. Water Resources and Hydropower Engineering. Background technique [0002] Measures for foundation seepage control of face rockfill dams built on overburden or fully and strongly weathered rocks (such as soft rocks) with high permeability and poor irrigated properties. Conditions are determined through comprehensive technical and economic comparisons. [0003] The anti-seepage measures of hydraulic structures mainly include two categories: horizontal bedding anti-seepage and vertical anti-seepage. [0004] Horizontal bedding anti-seepage is the most commonly used anti-seepage measure, which is mainly used to exten...

AI Technical Summary

Problems solved by technology

[0007] If the engineering quantity of the cut-off wall is large, the construction period of the cut-off wall, the toe board and the face plate often overlap. Since the cut-off wall is usually constructed first, and then the toe board is constructed, but the construction period of the cut-off wall is longer. If the toe board is not Construction will affect the construction of cushion, transition layer, panel, etc.

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