Design and construction method of rigid concrete anti-seepage wall on deep covering layer
A technology of concrete cut-off walls and deep covering layers, applied in water conservancy projects, sea area projects, dams, etc., can solve problems such as tension and compression damage of cut-off bodies, achieve the effect of improving stress and deformation state, and facilitating daily maintenance
Inactive Publication Date: 2019-05-21
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Engineering examples show that both of the above two methods have tension and compression failure of the anti-seepage body caused by uncoordinated deformation caused by the later filling construction of the dam body
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[0021] The present invention will be described in detail below in conjunction with the implementations shown in the drawings, but it should be noted that these implementations are not limitations of the present invention, and those of ordinary skill in the art based on the functions, methods, or structural changes made by these implementations Equivalent transformations or substitutions all fall within the protection scope of the present invention.
[0022] This embodiment provides a design and construction method for a rigid concrete cut-off wall on a deep overburden layer, including the following steps:
[0023] 1) Consolidation grouting at a depth of 20m along the dam axis on the centerline of the cutoff wall and within 30m downstream;
[0024] 2) The inverted trapezoidal foundation pit is excavated with the anti-seepage wall as the center line, and the rigid concrete anti-seepage wall is constructed in two phases; the first phase of excavation and construction of the anti-...
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The invention provides a design and construction method of a rigid concrete anti-seepage wall on a deep covering layer. The design and construction method comprises the steps that 1, consolidation grouting with the depth of 20 m is conducted in the axial direction of a dam within the range of 30 m of the upstream and the downstream of the center line of the anti-seepage wall; (2) an inverted trapezoidal foundation pit is excavated with the anti-seepage wall as the center line, and the rigid concrete anti-seepage wall is constructed in two stages, wherein first-stage anti-seepage wall drillingexcavation and construction are completed at the bottom of the inverted trapezoidal foundation pit; (3) the second-stage anti-seepage wall is constructed in the foundation pit, and an inverted trapezoidal concrete cushion pedestal is constructed on the two sides of the foundation pit, and the concrete cushion pedestal and the anti-seepage wall are not connected; (4) a concrete gallery is constructed on the platform on the upper portion of the concrete pedestal, and dam body filling construction is started till reaching the dam top; and 5) an asphalt wood plate is arranged between the second-stage anti-seepage wall and the concrete pedestal before the dam body accumulates water, and arranging two water stops between the top of the concrete pedestal and the anti-seepage wall to complete theconstruction of the whole anti-seepage system of the dam body. The method can improve the ability of the whole anti-seepage system to resist inharmonious deformation, and effectively reduces the tensile and compressive stress amplitude of the rigid concrete anti-seepage wall in the covering layer.
Description
technical field [0001] The invention relates to the technical field of asphalt core rockfill dam engineering, in particular to a design and construction method of a rigid concrete cut-off wall on a deep covering layer. Background technique [0002] In Northwest my country, due to the limitation of topography and geological conditions, some asphalt core rockfill dam projects are located on the deep covering layer with a depth of more than 50m. The anti-seepage system composed of rigid concrete cut-off wall and asphalt core wall Security is a big concern. Asphalt core wall rockfill dam is an earth-rockfill dam that uses concrete cut-off walls, concrete corridors and asphalt core walls in the covering layer as anti-seepage facilities. It is mainly composed of rockfill bodies and anti-seepage systems, namely: concrete cut-off walls, corridors Road, asphalt core wall, upstream and downstream rockfill areas. [0003] At present, there are mainly two methods for the design of anti...
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Inventor 钟红严祖文李红军李德玉涂劲赵剑明殷旗欧阳金惠李春雷刘诗岳
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES