Earth-rock dam deep-base seepage-control water-stopping structure for water conservancy and hydropower project

A water conservancy and hydropower, dam foundation anti-seepage technology, applied in water conservancy projects, marine engineering, construction, etc., can solve the problems of inability to adapt to the depth of the dam foundation and the requirements of the anti-seepage structure, control within 70m, and prominent anti-seepage problems, etc. The effect of preventing leakage, improving rationality, improving impermeability and durability

Active Publication Date: 2008-06-18
POWERCHINA CHENGDU ENG
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AI-Extracted Technical Summary

Problems solved by technology

[0003] Reservoir dams usually involve relatively complex foundation conditions. Statistics show that, limited by design theory, construction equipment and technology, as well as reasonable construction period and economic requirements of the project, the foundation anti-seepage depth of early reservoir dams is generally controlled at 70m Within; only the dam body anti-seepage layer extending from the top of the dam body to the bott...
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Method used

As shown in Fig. 1~Fig. 7, water conservancy and hydropower engineering earth-rock dam deep foundation anti-seepage water-proof structure of the present invention, comprises the dam body anti-seepage layer 2 that extends from dam body 1 top to dam body 1 bottom, in dam body The dam foundation at the bottom of the body 1 is provided with a dam foundation anti-seepage layer connected to the dam body anti-seepage layer 2 . The dam foundation anti-seepage layer connected to the dam body anti-seepage layer 2 can prevent the water in the dam body 1 from leaking from the dam foundation, thereby improving the stability of the dam foundation.
For configuring the anti-seepage layer of the dam foundation more reasonably, the anti-seepage layer of the dam foundation includes the upper floor anti-seepage layer 4 arranged in the strong water-permeable foundation course 7 of the dam foundation and the lower floor arranged in the weak water-permeable foundation course 8 in the dam foundation The anti-seepage layer 6, the upper anti-seepage layer 4 and the lower anti-seepage layer 6 are connected by a corridor 5 made of reinforced concrete to form an integrated structure. The strong water-permeable ground base 7 is the dam base that the water in the dam body 1 is very easy to form seepage, and the middle and weak water-permeable ground base 8 is the dam base that the water in the dam body 1 is more likely to form the seepage; To prevent the leakage of water in the strong water-permeable ground base 7, the structural form of the seepage wall can be adopted, that is, the special drilling rig equipment is used to divide the stratum into several groove section units along the direction of the anti-seepage design axis of the dam foundation. A basic anti-seepage treatment method that splits into grooves, pours concrete in the grooves, and finally connects all the groove section units into an anti-seepage whole; the lower anti-seepage layer 6 is used to prevent water leakage in the weakly permeable ground base 8, The structural form of anti-seepage wall and grouting curtain can be adopted, or the combined structure of anti-seepage wall and grouting curtain can be adopted. The structural form of grouting curtain is to use a drilling rig to drill holes in the formation, and drill through the hole wall to the surrounding formations. Cement (or other) grout is poured, and finally a certain thickness and continuous composite foundation anti-seepage body is formed in the direction of the anti-seepage design axis; a corridor 5 is set between the upper anti-seepage layer 4 and the lower anti-seepage layer 6 to prevent water Leakage between the upper anti-seepage layer 4 and the lower anti-seepage layer 6 is also convenient for the construction and maintenance of the upper anti-seepage layer 4 and the lower anti-seepage layer 6. 5 construction work.
For making the dam body anti-...
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Abstract

The present invention discloses an anti-seepage sealing structure of the deep foundation of the earth-rockfill dam of a water conservancy and hydropower project, which can effectively prevent the seepage of the dam. The anti-seepage sealing structure of the deep foundation of the earth-rockfill dam of the water conservancy and hydropower project includes the anti-seepage layer of the dam body which is stretched from the top of the dam body to the bottom of the dam body, and the anti-seepage layer of a dam base, which is jointed with the anti-seepage layer of the dam body, is arranged in the dam base of the bottom of the dam body. By arranging the anti-seepage layer of the dam base in the dam base, the anti-seepage sealing structure can effectively prevent water seepage in the dam, thus increasing the anti-seepage property and durability of the whole dam and the foundation. Moreover, according to the different distributions of permeable layers from strong to weak in the dam base, the anti-seepage layers are arranged accordingly, thus improving the rationality of the anti-seepage structure, and particularly, the present invention is suitably applied on water conservancy and hydropower dams.

Application Domain

Technology Topic

Embankment damWater seepage +3

Image

  • Earth-rock dam deep-base seepage-control water-stopping structure for water conservancy and hydropower project
  • Earth-rock dam deep-base seepage-control water-stopping structure for water conservancy and hydropower project
  • Earth-rock dam deep-base seepage-control water-stopping structure for water conservancy and hydropower project

Examples

  • Experimental program(2)

Example Embodiment

[0030] Example 1: As shown in Figure 1, Figure 3 ~ Figure 5 Shown is the anti-seepage and water-stop structure of the deep foundation of the present invention for the face rockfill dam. The deep anti-seepage layer of the dam foundation is divided into two sections, the upper anti-seepage layer 4 and the lower anti-seepage layer 6, by the reinforced concrete connecting gallery 5 as the boundary. , The upper impermeable layer 4 strong permeable foundation adopts concrete impervious wall to prevent seepage, the ground construction, the maximum wall depth is 80m; the lower impervious layer 6 foundation has medium to weak water permeability, adopts 3 rows of grouting curtains to prevent seepage, in corridor 5 For construction, the maximum depth of the curtain is 120m, and the bottom of the curtain is 3~5m deep into the impervious foundation; the net size of corridor 5 is controlled by the needs of curtain construction and is determined to be 3m×3.5m.

Example Embodiment

[0031] Example 2: As shown in Figure 2, Figure 6 ~ Figure 7 Shown is the deep foundation anti-seepage and water-stop structure of the present invention for the core rockfill dam. It is based on the above-mentioned structural form. The deep anti-seepage body of the dam foundation is divided into the upper anti-seepage structure by the reinforced concrete connecting gallery 5 as the boundary. Layer 4 and lower impermeable layer 6 are two sections. The upper impermeable layer 4 is strongly permeable foundation with concrete impervious wall, ground construction, the maximum wall depth is 80m; the lower impervious layer 6 has strong water permeability to medium, and the first 60m is used The concrete anti-seepage wall and the rear 60m adopt a grouting curtain, and the bottom of the curtain is 3~5m deep into the impervious foundation; the net size of corridor 5 is controlled by the construction needs of the anti-seepage wall and is determined to be 6m×6.5m.
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Description & Claims & Application Information

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