Deep permeable interlayer dam foundation anti-seepage structure and construction method

By leveraging the synergistic effect of the in-situ cemented seepage barrier wall, filling column, and curtain in the deep permeable interlayer dam foundation seepage prevention structure, the problems of hole collapse and poor seepage prevention effect in deep permeable interlayer dam foundations have been solved, achieving efficient and reliable seepage prevention effect and convenient construction.

CN121827368APending Publication Date: 2026-04-10NORTHWEST ENGINEERING CORPORATION LIMITED
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Patent Information

Application Number
CN202610233711.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-27
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

Existing technologies for treating deep permeable interlayer dam foundations suffer from problems such as easy borehole collapse, poor seepage prevention effect, and low construction efficiency, making it difficult to achieve a good balance between reliability, economy, and ease of construction.

Method used

The deep permeable interlayer dam foundation seepage prevention structure is adopted, including in-situ cemented seepage prevention wall, filling column, pressure cap and curtain. The continuous seepage prevention structure is formed by in-situ mixing and cementing process and grouting process. Combined with the sequential construction process, it ensures that the cementing material is evenly diffused and tightly bonded in complex strata.

Benefits of technology

It effectively cuts off groundwater seepage channels, reduces uplift pressure and seepage flow in the dam foundation, improves the continuity and reliability of the seepage prevention body, reduces disturbance to the superstructure, enhances construction efficiency and overall stability, and achieves a balance between reliability and economy.

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Abstract

The invention discloses a deep permeable interlayer dam foundation anti-seepage structure and a construction method. The anti-seepage structure is arranged along the axis of a dam foundation and comprises an in-situ cementing anti-seepage wall with the bottom embedded into a rock bottom plate, filling columns evenly distributed on the wall, glands covering the tops of the columns and combined with a dam body, and a curtain arranged at the bottom of the wall and continuously arranged in rock. During construction, a drill hole is drilled firstly, construction of the in-situ cementing diaphragm wall and the filling column is completed synchronously, and a gland is formed through backfilling; and then a grouting pipe is pre-buried for segmented curtain grouting. According to the invention, a multilayer anti-seepage system of'surface plugging-deep cutting-bottom seepage prevention 'is constructed, a deep permeable channel can be effectively cut off, and uplift pressure and seepage flow are reduced. And by dynamically adjusting the stirring and grouting process, disturbance to upper-layer soil rock is reduced, the continuity and reliability of an anti-seepage body and the overall stability of a dam foundation are improved, and good construction controllability and economical efficiency are achieved.
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