Construction method and structure of hydraulic core-wall rockfill dam without cofferdams

Abstract

The invention discloses a construction method of a hydraulic core-wall rockfill dam without cofferdams. The method comprises the following steps: filling an upstream and downstream mixed riprap area (4); filling a transitional rock filling area (3); filling a fine rock filling area (2); filling an upstream large crushed rock revetment area (5); constructing a core-wall anti-seepage area (1). The invention further discloses a core-wall rockfill dam structure without cofferdams obtained according to the construction method. According to the invention, anti-seepage cofferdams do not need to be constructed on the upstream and the downstream of the dam, and the foundation of the dam does not need to be excavated and processed, so that pumping of foundation pits is reduced, the utilization rate of excavated aggregated rock of buildings is improved, the cofferdams do not need to be dismantled in the later period, the construction technology is simplified, the construction period is shortened, and the engineering investment is saved.

Description

technical field [0001] The invention relates to a cofferdam-free construction method and structure of a hydraulic core rockfill dam, which is particularly suitable for a rockfill dam structure with low water head and wide riverbed, and belongs to the technical field of core rockfill dam construction in water conservancy and hydropower projects. Background technique [0002] In water conservancy and hydropower projects, due to the needs of irrigation water intake or power generation, it is usually necessary to build a dam to form a reservoir. Many dams under construction and proposed to be constructed choose rock-fill dams. Conventional rockfill dams need to build anti-seepage cofferdams upstream and downstream. After the cofferdams are closed, the water in the foundation pit will be drained, and then the foundation excavation and filling construction of the rockfill dam will be carried out. For downstream cofferdams, especially large and medium-sized projects with wide river...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a new construction method and structure of a rockfill dam that cancels the upstream and downstream cofferdams, so that there is no need to build anti-seepage cofferdams on the upstream and downstream, and it is not necessary to excavate and treat the dam foundation. Excavating materials to solve the technical problems of directly carrying out rockfill dam filling construction without cofferdam protection, so as to save construction time and investment

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