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A test device and method for simulating creep of geomembrane under cushion constraints

A constraint condition, testing device technology, applied in the direction of measuring device, using stable tension/pressure testing material strength, instrument, etc. Considering the influence of cushion constraint on the creep characteristics of geomembrane, the effect of preventing slippage, low price and easy control is achieved

Active Publication Date: 2019-04-26
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing creep test devices basically do not consider the influence of cushion constraints on the creep characteristics of geomembranes.
Since the geomembrane is bound to be constrained by the cushion in actual engineering, the cushion will affect the creep of the geomembrane, so the existing test device cannot truly simulate the creep behavior of the geomembrane when it is constrained by the cushion
[0006] In addition, geomembranes are subjected to multi-level constant tensile loads in actual engineering, but the existing creep test devices only consider exploring the creep characteristics of geomembranes under single-level constant tensile loads, and cannot reflect the characteristics of geomembranes. Creep behavior under multi-stage constant tensile load

Method used

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  • A test device and method for simulating creep of geomembrane under cushion constraints
  • A test device and method for simulating creep of geomembrane under cushion constraints
  • A test device and method for simulating creep of geomembrane under cushion constraints

Examples

Experimental program
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Effect test

Embodiment 1

[0075] Embodiment 1: Creep test of geomembrane under single-stage constant tensile load, including the following steps.

[0076] Step 1, cutting of geomembrane samples: select a geomembrane with a thickness of t (preferably 1.0mm), and cut at least 9 geomembrane samples according to the size (length×width) 200mm×100mm.

[0077] Step 2, the selection of single-stage constant tensile load of geomembrane: according to the ultimate tensile force of geomembrane, three tensile loads G are selected according to the ultimate tensile force of 20%, 40% and 60%. 1 (5kg), G 2 (10kg) and G 3 (15kg).

[0078] Step 3, installation of the geomembrane sample: Fix the two ends of the geomembrane sample in step 1 to the gap in the middle of the base and the movable fixture respectively.

[0079]Step 4, installation of the cushion application system: place the cushion chamber on the upper surface of the base and close to the movable fixture, fill the cushion chamber with fine sand according to...

Embodiment 2

[0088] Example 2: Creep test of geomembrane under multi-level constant tensile load, including the following steps:

[0089] Step 1, cutting of geomembrane samples: select geomembrane with a thickness of t (preferably 1.0mm), and cut at least 3 geomembrane samples according to the size (length × width) of 200mm × 100mm.

[0090] Step 2, the selection of multi-level constant tensile load: the tensile creep of the geomembrane is divided into three stages, and the creep time of the three stages is T respectively 1 (100h), T 2 (120h) and T 3 (150h), according to the ultimate tensile force of the geomembrane, the tensile load G of three stages is selected according to the ultimate tensile force of 20%, 40% and 60% 1 (5kg), G 2 (10kg) and G 3 (15kg).

[0091] Step 3, installation of the geomembrane sample: fix the two ends of the geomembrane sample in step 1 in the gap in the middle of the base and the movable fixture respectively.

[0092] Step 4, installation of the cushion ...

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Abstract

The invention discloses a testing device and method for creepage of a geomembrane under simulated cushion constraint conditions. The testing device comprises a tensile test system, a cushion applyingsystem and a displacement collection system, wherein the tensile test system comprises a main frame platform, a base, a geomembrane, a movable clamp, a wire rope, a braking device, a fixed pulley andweights, one end of the geomembrane is fixed into a seam in the middle of the base, and the other end of the geomembrane is fixed through the movable clamp; the cushion applying system comprises a cushion room, a cushion material, an air pressure adjusting device, an upper cover plate, a pressure air bag, a force transmission plate, a horizontal push device and a movable push rod; the displacementcollection system comprises a displacement sensor, a data collector and a computer. By means of the testing device, it is achieved that the creep property of the geomembrane is tested when the geomembrane is restrained by a cushion, the creep deformation of the geomembrane is recorded in real time under single-stage constant or multi-stage constant tension loads, and the creepage curves of the geomembrane under the actions of different constant tension loads are obtained so as to be used for analyzing the creep property of the geomembrane.

Description

technical field [0001] The invention relates to the field of deformation detection of anti-seepage geomembrane in water conservancy projects, in particular to a test device and method for simulating the creep of geomembrane under the constraint condition of cushion layer. Background technique [0002] Geomembrane has been widely used in anti-seepage projects such as dams, warehouses, and channels because of its good anti-seepage performance, strong adaptability to deformation, and low engineering cost. When the geomembrane is laid on the upstream surface of the dam as an anti-seepage body, under the action of reservoir water pressure, the geomembrane on the dam surface will exhibit tensile characteristics. Under a certain tension, the deformation of the geomembrane will increase with time, that is, creep. [0003] Since reservoirs generally store water in stages, the water level will be maintained for a period of time every time the water is stored to a certain height. At t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/14
CPCG01N3/14G01N2203/0017G01N2203/0033G01N2203/0071
Inventor 岑威钧都旭煌陈司宁王辉罗佳瑞李邓军
Owner HOHAI UNIV
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