Abstract
The cushion of a geomembrane surface barrier of a high rockfill dam built on deep overburden is prone to crack and fail because of excessive flexural deformation. This study proposes a geomembrane surface barrier for a high rockfill dam on deep overburden. The proposed geomembrane surface barrier uses polyurethane bonded aggregates as the cushion material. The loading and deformation performance of the barrier system under uniform water pressure was investigated using a self-developed structure model test device. The mechanical and deformation property of each layer of the barrier, and the interaction mode between adjacent layers, were obtained through external videos and internal sensor monitoring. The results demonstrated that the polyurethane bonded aggregate cushion exhibited good adaptability to flexural deformation during the entire loading process and maintained good contact and coordinate deformation with the upper protective and the lower transition layers. The geomembrane surface barrier created using polyurethane bonded aggregates as the cushion material can adapt to the flexural deformation of a high rockfill dam surface on deep overburden.
Highlights
For a high rockfill dam built on deep overburden, the dam surface will produce large deflection deformation because of the large deformation of the dam body and foundation
This study proposes a geomembrane surface barrier for a high rockfill dam on a deep overburden that uses polyurethane bonded aggregates as the cushion material
This study proposes a new type of geomembrane surface barrier that employs polyurethane bonded aggregates as the cushion material for high rockfill dams on deep overburden
Summary
For a high rockfill dam built on deep overburden, the dam surface will produce large deflection deformation because of the large deformation of the dam body and foundation. Polyurethane bonded aggregates have stronger deformation adaptability than traditional materials such as porous concrete They are well suited as a cushion material for the geomembrane surface barrier of a high rockfill dam [7]. No research has been conducted on the failure characteristics of geomembrane and cushion of polyurethane-bonded aggregates under the non-uniform settlement deformation of the dam surface conditions. This study proposes a geomembrane surface barrier for a high rockfill dam on a deep overburden that uses polyurethane bonded aggregates as the cushion material. Both the composition and the advantages of the new type of barrier are described in detail. The test results can be used as guidance for relevant research and future engineering designs
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