A dam surface geomembrane anti-seepage rockfill dam, construction method and defect location method

Abstract

The invention discloses a dam-face geomembrane seepage prevention rockfill dam, a construction method and a defect location method. The dam-face geomembrane seepage prevention rockfill dam comprises several independent dam sections which are sequentially arranged in the axial direction of a dam body; each independent dam section comprises a buttress, a rockfill body, a seepage prevention body anda defect seepage monitoring system; upstream faces of all the independent dam sections are in an arched shape leaning towards the upstream part, and the upstream dam slope ratio is 1:0.2; each seepageprevention body comprises a geotechnical mat, a composite geomembrane and a cast-in-place concrete protection layer; each defect seepage monitoring system comprises multiple drainage pipe groups andflowmeters. By means of the dam-face geomembrane seepage prevention rockfill dam, two key technical problems which restrict the development of geomembrane seepage prevention rockfill dams are solved;composite geomembrane separate dam sections are laid on an arched dam face, and the situation can be effectively avoided that the geomembranes are pulled and deformed on the dam face, and cramp effects are caused at surrounding anchoring portions; through the utilization of the defect seepage monitoring systems which are arranged at different areas of the separate dam sections, defect seepage of the composite geomembranes can be quickly and accurately located, and the problem that defects of an existing rockfill dam seepage prevention geomembrane are hard to accurately locate is solved.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering, in particular to a dam surface geomembrane anti-seepage rockfill dam, a construction method and a defect positioning method. Background technique [0002] Geomembrane is a kind of flexible film anti-seepage material, which has been continuously used in various anti-seepage projects such as earth-rock dams. According to the statistics of the International Commission on Large Dams (ICOLD) in 2010, 167 large earth-rock dams around the world have adopted geomembrane anti-seepage. According to incomplete statistics, more than 40 newly built rockfill dams and earth-rock cofferdams in my country have adopted geomembrane anti-seepage, such as the Xiaolingtou rockfill dam in Zhejiang Province, the Renzonghai Rockfill Dam in Sichuan Province, and the Wenquan pile in Qinghai Province. For the stone dam and the upstream earth-rock cofferdam of Baihetan, etc., geomembrane anti-seepage is...

AI Technical Summary

Problems solved by technology

(2) Using the defect leakage monitoring system set up in sub-dam sections and regions, the defect leakage of the composite geomembrane can be quickly and accurately located, which solves the problem that the existing earth-rock dam anti-seepage geomembrane defect is difficult to accurately locate

Images