Test platform of rock-fill dam mask impervious structure model on deep overburden layer

Abstract

The invention discloses a test platform of a rock-fill dam mask impervious structure model on a deep overburden layer. The platform is formed by a model box, a counter force frame, a loading system, a water pressure simulation device, a flexural deformation simulation device and a test system. The model box is arranged in the counter force frame. The flexural deformation simulation device is located at the bottom of the model box so as to simulate an impervious structure bottom deflection displacement boundary condition. The loading system applies vertically downward pressure through the counter force frame and transmits a flexible pressure load to the top surface of an impervious structure model. A testing system is formed by an earth pressure sensor, a strain, a displacement meter and a data collection instrument which are arranged in the structure model and a high-definition digital camera at a side of the model box together carries out real-time monitoring on the structural state. The platform can be used for the model test research of force deformation characteristics and failure mechanism of a deep overburden layer rock-fill dam mask impervious structure in the condition of surface water pressure load and large bottom deflection.

Description

technical field [0001] The invention relates to a model test device used in the technical field of hydraulic structure engineering, in particular to a model test platform for an anti-seepage structure of a rockfill dam mask on a deep covering layer. Background technique [0002] For a rockfill dam built on a deep overburden layer, due to the large deformation of the dam foundation and dam body in the overburden layer, the dam surface will have a large deflection deformation. As for the geomembrane anti-seepage structure on the surface of rockfill dams (referred to as the mask anti-seepage structure), excessive deflection will cause cracks or even dislocation of the geomembrane cushion and protective layer, which will endanger the geomembrane under the action of water pressure. next to the security. The anti-seepage structure of the mask is generally composed of multi-layer materials such as the cushion layer, the anti-seepage film and the protective layer, and the mec...

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Problems solved by technology

[0004] (1) If a large-scale centrifuge model test is used, due to the large volume of the rockfill dam and the deep overburden, even a large centrifuge cannot accommodate the entire model; if the scale is further reduced, compared to the entire dam foundation and The size of the dam body and the anti-seepage structure of the mask are too small (the thickness of the geomembrane is less than 2mm), and its material properties and structure cannot be simulated in the centrifugal model;

[0005] (2) Due to the small size of the anti-seepage structure in the overall model, it is also difficult to select, arrange and embed test instruments;

[0006] (3) If local centrifuge model tests are used, the boundary conditions of different parts of the local structural model are difficult to determine and cannot be accurately simulated in a centrifuge;

[0007] (4) The cost of centrifugal model test is also relatively high, so the economical efficiency of this test method is poor

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