Device and method for predicting burst strength of geomembrane considering the influence of moisture content of underlying layer

Abstract

The invention discloses a geomembrane burst strength prediction device and method considering a lower cushion layer moisture content influence. A geomembrane assembling system, a pressurization systemand a computer are included. The geomembrane assembling system comprises a cushion layer chamber, a protection layer chamber and a clamp. The pressurization system comprises a top rod, a pressure sensor and a pressurization device. The bottom end of the top rod points to the center of a geomembrane. Top rod types comprise a flat head top rod, a semi-arc top rod and a flat plate top rod. The different top rod types are used for simulating different construction work types. The different forms of top rods are used to simulate construction loads, the burst tests of the geomembrane when there arethe lower cushion layers with different moisture contents are performed, and geomembrane burst strength is obtained. According to the distribution characteristics of the burst strength of the geomembranes with different thicknesses on the lower cushion layers with the different moisture contents, the index model of the geomembrane burst strength is established, a geomembrane burst strength calculation formula is acquired, and the burst strength of the geomembranes of the lower cushion layers with the different moisture contents under different construction pressurization conditions in actualengineering is predicted.

Description

technical field [0001] The invention relates to the detection field of geomembrane in water conservancy projects, in particular to a geomembrane burst strength prediction device and method considering the influence of the water content of the underlying layer. 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. [0003] In the geomembrane anti-seepage structure, the geomembrane is buried between the upper protective layer and the underlying layer. Different types of geomembrane anti-seepage projects use geomembranes of different thicknesses, and the requirements for controlling the moisture content of the underlying material are also different. When the moisture content of the underlying layer increases, the deformation modulus of the underlying layer decreases....

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Problems solved by technology

[0006] 1. In the prior art, only a single geomembrane without an underlying layer is subjected to a burst test, without considering the supporting effect of the underlying layer on the geomembrane

In actual engineering, the geomembrane is laid on the underlying cushion, and the moisture content of the cushion will cause the change of the deformation modulus of the cushion, thereby changing the deformation resistance of the geomembrane under the action of the upper load, that is, changing the bursting characteristics of the geomembrane. Some technologies are out of the working state of geomembrane in actual engineering

[0007] 2. The existing standard test device uses a fixed-size cylindrical mandrel to exert pressure on the geomembrane, which cannot reasonably simulate the pressure conditions of the geomembrane by compaction machinery, transport vehicles, and operators in actual engineering.

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