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Several methods of dam grouting reinforcement to prevent leakage

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Several methods of dam grouting reinforcement to prevent leakage

作者: Release Date: 2017-09-23 Author: Click:

The first: low-pressure low-speed solidification grouting method.

As long as this method is used for emergency blockage at high water levels, drilling operations can be performed according to the address of the location of the piping, and then the expansion material is injected into the hole, and then the pressure is slowly poured into the hole and added. Cement slurry of accelerator for water glass. The swelling material is to increase the resistance of the piping and slow down the water flow in the piping. In order to prevent the cement slurry from flowing out with the water flow, the cement slurry is a fast-setting cement, so the holes can be blocked quickly in a short time live.

The second: high-pressure filling grouting method.

This method is mainly used in the dam foundation grouting scene, and it can also be used to fill the ant holes and karst caves of the dam. It is mainly to use a 50m engineering rig to drill holes from the top of the embankment to be irrigated, the hole distance is 1.5 ~ 2.0m, and the hole depth is appropriate to penetrate the sand layer into the gravel layer about 2m. The pressure during grouting is generally 127.40 ~ 166.60kPa. The casing goes down to the filling layer to ensure that the dyke body is dry, the gravel layer at the base is poured into the cement slurry, and then gradually lifted to the soil layer, and the hole is sealed with yellow mud. This grouting method is mainly used to control piping caused by poor foundation. When used to fill ant caves and karst caves, a 30-type grinder for grouting is used to fill holes around the ant caves or karst caves to form mud and form a surrounding circle, and then fill it until it is full.

The third: split curtain grouting method.

The so-called split curtain grouting is mainly used to reinforce the dyke body and prevent the dyke body from leaking. The method is to use a shallow hole light rig or a simpler drilling tool according to the different conditions of the dam bend, and use a plum-shaped hole and a straight line hole to drill holes 1.5m away from the outer shoulder of the embankment along the embankment axis. At a distance of 3m, the hole depth should be drilled through the embankment to fill the soil or drill through the embankment into the foundation 1 ~ 2m. During grouting, bottom-up, less irrigation and more complex; mud from thin to thick, and gradually; pressure from large to small, flexible control. In this way, various problems such as grouting, stringing, landslides, and local bulges during grouting can be better dealt with, so that the poured mud forms a curtain along the axial direction of the embankment, thereby improving the quality of the embankment body, improving the rigidity and The purpose of preventing leakage.

The fourth type is to form an impervious body through grouting reinforcement. This method is suitable for the masonry gravity dam. The upstream surface of the dam is consolidated for grouting, plugging loopholes and gaps, strengthening and reinforcing the dam and improving the anti-seepage performance to further improve the bearing capacity and integrity of the dam. Consolidation grouting is tracked on the downstream surface of the dam. Where there is leakage or erosion of the downstream dam surface, horizontal or oblique holes are caused, and the grouting pipe is buried to grout to block the leaking channel and the dam body ’s voids and cracks to strengthen the dam body. The reverse grouting process, which increases dam surface stability and erosion resistance, is very suitable for arch dam and branch pier dam projects. For gravity dam projects, only the clearing pressure and drainage holes can be used. It is best to use this method. There is no water in front of the dam. The joints on the dam surface are re-cut. After the joints are removed, the joints with high-grade cement mortar dry hard pre-shrinked cement mortar or waterproof materials are used to prepare the joints with high-grade cement mortar to improve the anti-leakage ability of the dam surface and the overall stability, integrity and Ability to resist freezing and thawing, and resistance to wind and waves. This method is called "front blocking, middle interception, rear tracking" grouting and leakage strengthening method.

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