Anti-seepage blanket structure for dam foundation and reservoir bottom and construction method of anti-seepage blanket structure

Abstract

The invention discloses a dam foundation reservoir bottom anti-seepage blanket structure and a construction method thereof.The dam foundation reservoir bottom anti-seepage blanket structure comprises a cemented sand gravel anti-seepage blanket layer and a connecting seam structure between the cemented sand gravel anti-seepage blanket layer and a dam pedestal, and the cemented sand gravel anti-seepage blanket layer is formed by mixing river bed excavation natural rock ballast with a proper amount of cement and water and then conducting rolling; and the connecting seam structure can realize reliable connection between the gelled sand gravel seepage-proofing blanket layer and the dam. The construction method comprises the following steps: preparing and mixing gelled sand and gravel; the cementitious sand gravel seepage-proofing blanket is subjected to paving and rolling construction along with the terrain; and treatment of a cementing sand gravel blanket construction lap joint section is carried out. According to the method, the river bed excavation natural rock ballast is used as the aggregate, the cemented sand gravel seepage-proofing blanket layer is laid at the reservoir bottom of the dam foundation, the seepage-proofing problem of the dam foundation is solved, the requirement of desilting after the flood every year for reservoir bottom hardening is met, construction is convenient and rapid, river bed excavation abandoned materials are fully utilized, and obvious ecological benefits and economic benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering, in particular to an anti-seepage bedding structure at the bottom of a dam foundation and a building method thereof. Background technique [0002] Flood interception dams and mud retaining dams of tailings ponds are generally built in the upstream streams of tailings ponds, and gravity dams or earth-rock dams are often used. Ensure the flood control safety of the tailings pond during the flood season. The geological conditions of flood interception dams and mud retaining dam sites are often deep overburden dam foundations, which requires solving the problem of anti-seepage of dam foundations; in addition, the silt intercepted in the reservoir needs to be cleared every year. In order to ensure the normal operation of dredging machinery, the The bottom of the reservoir is required to be hardened. [0003] At present, the method usually adopted for anti-seepage treatment of da...

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a dam foundation reservoir bottom anti-seepage bedding structure and its construction method, aiming to solve the problem that the existing dam foundation anti-seepage implementation curtain grouting method will produce large shear deformation and be sheared and fail, and the reservoir bottom will be hardened. The method of pouring the hardened concrete layer is expensive and prone to cracking

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