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A method for repairing cracks in earth-rock dam body

A repair method and technology for earth-rock dams, applied in the field of repairing cracks in earth-rock dams, can solve the problems of general repair effect, long construction period, and long setting time, and achieve shortened construction time, low construction cost, and high tensile performance Effect

Active Publication Date: 2019-01-15
CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
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Problems solved by technology

In addition, the above-mentioned grouting slurry has a long setting time, a long construction period, and low efficiency, and the slurry is a non-expanding slurry material. After solidification, new cracks will be generated due to volume shrinkage, and the repair effect is average.

Method used

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  • A method for repairing cracks in earth-rock dam body
  • A method for repairing cracks in earth-rock dam body

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Embodiment

[0036] combine figure 1 and figure 2 As shown, a core rockfill dam located on a deep overburden layer with a dam height of 200m, during the operation of the dam after its completion, a number of longitudinal dam body cracks 101 approximately parallel to the dam axis and vertical dam axis cracks appeared on the dam crest. The transverse dam body crack 101 becomes a potential safety hazard of the dam.

[0037] Utilize the method of the present invention to repair the dam body crack 101 of the above-mentioned core wall rockfill dam, the steps are as follows:

[0038] a. Arrange an in-seam grouting hole 201 at an interval of 2m in the dam body 100 at the dam body crack 101 along the direction of the dam body crack 101; use a drilling tool to arrange the holes, and drill the in-seam grouting hole 201 to the dam 0.5m below the body crack 101, the diameter of the grouting hole 201 set in the crack is not less than the width of the dam body crack 101 where it is set;

[0039]b. Se...

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Abstract

The invention belongs to the technical field of hydraulic and hydropower engineering, and in particular, discloses an earth and rockfill dam body crack repair method with short construction period and good repair effect. The repair method comprises the following steps: firstly, the high polymer grouting is performed for dam body cracks; the characteristic of quick volume expansion and dispersion of high polymer slurry after the polymerization reaction is used for fully filling the dam body cracks and holes in soil around the dam body cracks in the expansion and dispersion process; and then, the high polymer grouting is performed for two sides of the dam body cracks, so that the soil and high polymers in a certain range around the dam body cracks are glued to form high polymer grouting compound bodies to finish repair of the dam body cracks. As the high polymers are used for grouting, the maintenance is not needed, the construction period is largely shortened, and the repair is fast; and the formed high polymer grouting compound bodies are flexible bodies, are high in tensile strength and deformation adapting capacity, and can prevent the dam body cracks from cracking again due to such factors as water level change to achieve good repair effect.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and in particular relates to a method for repairing cracks in an earth-rock dam body. Background technique [0002] Earth-rock dams are a type of dam widely used in water conservancy and hydropower engineering construction. According to incomplete statistics, 18,595 dams over 15m in length have been built in my country, of which earth-rock dams account for 93% of the total. Dam cracks are common hidden dangers and one of the main failure types of earth-rock dams. Among the quality problems of large reservoir dams in my country, about 39% belong to the cracks of earth-rock dams. Due to the existence and development of cracks in the dam body, the reservoir must be operated at a low water level, and the comprehensive benefits of the reservoir cannot be fully utilized. When the problem is serious, it may cause catastrophic consequences such as dam failure. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B3/16E02D3/12E02D15/04
CPCE02B3/16E02D3/12E02D15/04E02D2250/003
Inventor 余挺叶发明杨星何兰冉从勇
Owner CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
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