A geomembrane hydraulic bursting and particle puncture deformation testing device and testing method
A technology of deformation testing and geomembrane, which is applied in the direction of testing material strength by one-time impact force, measuring device, and testing material strength by applying stable tension/pressure. The process is simple and convenient, and the effect of accurate measurement results
Active Publication Date: 2019-04-05
HOHAI UNIV
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Problems solved by technology
None of the above three tests can truly simulate the working state of the geomembrane
[0004] In addition, there is no test device in the prior art that can reflect the deformation and development process of the complete geomembrane on the cushion under the action of hydraulic pressure, and the impact of the defect leakage that occurs after the geomembrane is broken and punctured on the underlying cushion the whole process
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[0046] The present invention will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments.
[0047] Such as figure 1 As shown, a geomembrane hydraulic bursting and particle puncture deformation test device includes a pressure deformation simulation device and a three-dimensional DIC measurement system 11 .
[0048] The pressure deformation simulation device includes a pressure system 9 and a base 1 , a cushion chamber 2 , a geomembrane 4 and a pressure chamber 3 arranged coaxially in sequence from bottom to top.
[0049] The bottom of the cushion chamber is fixedly connected with the base, the bottom of the side wall of the cushion chamber is preferably provided with a water outlet pipe, and a flow meter 12 is preferably arranged on the water outlet pipe. In this way, when the geomembrane is ruptured, by observing the water output of the flowmeter, etc., it is possible to further study the impact of the geomembrane burst an...
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Abstract
The invention discloses an apparatus and method for testing the hydraulic bursting and granular puncturing deformation of a geomembrane. The apparatus comprises a pressure deformation simulation device and a three-dimensional DIC measuring system; the pressure deformation simulation device comprises a pressurizing system, a base, a cushion chamber, the geomembrane and a pressure chamber; the cushion chamber is filled with soil and stones; the geomembrane is laid on the top of the soil and stones, and the pressure chamber and the geomembrane are enclosed to form a sealed chamber; the pressurizing system is used to supply pressure water into the pressure chamber; speckles are uniformly sprayed on the upper surface of the geomembrane; and the three-dimensional DIC measuring system includes ahalogen lamp, a computer, and two CCD cameras respectively connected with a computer. The apparatus can truly simulate the hydraulic bursting and cushion soil and stone granule puncturing effects of the geomembrane in the actual engineering and record the development process of the uneven deformation and the strain of the surface of the geomembrane under the action of a water pressure in details,so the hydraulic bursting resistance, the puncturing deformation resistance of the geomembrane and the hydraulic characteristics of an underlay layer of the geomembrane are obtained.
Description
technical field [0001] The invention relates to the field of geomembrane detection in water conservancy projects, in particular to a geomembrane hydraulic bursting and particle piercing deformation testing device and testing method. Background technique [0002] Geomembrane has been widely used in anti-seepage projects such as dams, warehouses, reservoirs, and landfills because of its good anti-seepage performance, strong adaptability to deformation, low project cost and fast construction speed. At present, the geomembrane anti-seepage of rockfill dams is mainly based on the anti-seepage of the dam surface. In the anti-seepage structure of the geomembrane on the dam surface, the earth-rock cushion under the film is very critical to the safe operation of the geomembrane. It is necessary to avoid piercing the geomembrane during design. . In addition to supporting the geomembrane, the cushion must also have good permeability in order to drain water timely and effectively and i...
Claims
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IPC IPC(8): G01N3/12G01N3/30G01N3/06
CPCG01N3/068G01N3/12G01N3/30G01N2203/0019G01N2203/0026G01N2203/0048G01N2203/0067G01N2203/0075G01N2203/0282
Inventor 岑威钧都旭煌陈司宁李邓军罗佳瑞王辉耿利彦
Owner HOHAI UNIV