Reverse seepage pressure treatment method for face-face dams on narrow valleys in rainy areas

Abstract

The invention discloses a reverse pressure seepage treatment method for a concrete faced dam on a narrow river valley in a rainy area during the construction period. A drainage channel with the certain flow passing capacity is excavated on the bedrock surface of the downstream of a toe board of a concrete faced rockfill dam along the cross section of bedrock by combining drainage during the construction period and the embedding requirements of a safety monitoring instrument, the drainage channel is backfilled with drainage materials, used as a drainage channel of construction water and rainwater during the construction period, used for collecting water seepage from a face board, allows a safety monitoring instrument to observe, and used as a downstream drainage channel. The reverse pressure seepage treatment method for the concrete faced dam on the narrow river valley in the rainy area during the construction period has the advantages that holes are prevented from being formed in the face board and the toe board of the concrete faced rockfill dam, and the integrity of a dam concrete structure is ensured; the blocking process of reverse drainage holes is omitted, resources are saved, the construction progress of concrete faced rockfill dam engineering is increased, and reliability of an anti-seepage system is ensured; and the reverse pressure seepage treatment method is combinedwith the safety monitoring instrument during the operation period, and the accuracy of measurement results is improved.

Description

technical field [0001] The invention relates to a face rockfill dam construction in a water conservancy and hydropower project, in particular to a reverse osmosis treatment method for a face dam on a narrow valley in a rainy area during construction. Background technique [0002] In water conservancy and hydropower projects, dams are usually built to form reservoirs due to the needs of water supply or power generation. Many dams under construction and proposed to be built choose concrete face rockfill dams. The water permeability of the dam material in the downstream area of ​​the face rockfill dam is higher than that in the upstream area, and meets the filter protection requirements for the dam material in the upstream area, so that the dam body can drain freely and prevent interlayer seepage damage when leakage occurs in the face plate. In order to meet the needs of deformation control and anti-seepage treatment, the plinth of the face rockfill dam has higher requirements ...

AI Technical Summary

Problems solved by technology

This method has many construction steps and high requirements, and the opening of the hole not only destroys the overall structure of the plinth, but also makes it difficult to ensure the quality of drainage pipe sealing, which brings hidden dangers to the safe operation of the dam and leakage control

For face rockfill dams built in rainy areas, in order to discharge accumulated water in a timely manner, the diameter and number of drainage pipes required are relatively large, especially for narrow river valleys. Seepage stability and anti-floating stability of the panel have adverse effects, and leave hidden dangers for the safe operation of the later anti-seepage system

[0003] According to relevant regulations, in order to measure the seepage of the dam body after the completion of the face dam, it is usually required to arrange a row of piezometers along the contact surface between the bedrock and the rockfill at the largest section of the dam body to measure the seepage. The surface is generally not a smooth plane, which makes it difficult to observe even if there is seepage during operation

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