Device and method for testing double contact cyclic shear of flexibly-tensioned geomembrane and soil

Abstract

The invention discloses a device and a method for testing the double contact cyclic shear of a flexibly-tensioned geomembrane and soil. A geomembrane shearing frame is connected with a flexible tensioning system, a motor drives gears to rotate forward and reversely to drive a chain horizontally to move back and forth with the geomembrane shearing frame, the device and the method are used for testing the double contact shear strength of the geomembrane and soil at different cyclic displacements of a simulated geomembrane under the action of normal stress, the chain of the flexible tensioning system is flexibly connected with the geomembrane shearing frame, and the test method can be used to detect the changing curve of the double contact shear strength of the geomembrane shearing frame withshear displacement under different normal stresses and different shear displacement amplitudes in order to obtain the change relationship of the cyclic shear strength and the damping ratio of the contact interface of the geomembrane and soil with the shear displacement.

Description

technical field [0001] The invention relates to the technical field of manufacturing shear test equipment for a geomembrane and soil contact surface, in particular to a flexible stretched geomembrane and soil double-sided contact cycle shear test device and test method. Background technique [0002] Geomembrane has been widely used in anti-seepage projects such as dams, warehouses, channels, and landfills because of its good anti-seepage performance, strong adaptability to deformation, low project cost and fast construction speed. my country is an earthquake-prone country with high frequency, high intensity, shallow focus, wide distribution and severe earthquake disasters. Due to the large difference between the mechanical properties of the geomembrane and the soil and stone materials on both sides, the seismic load will have an unfavorable cyclic dynamic effect on the anti-seepage engineering of the geomembrane, affecting the stability and structural safety of the geomembra...

AI Technical Summary

Problems solved by technology

[0004] 1) The existing direct shear instrument at the contact surface of geomembrane can only realize unidirectional shear, and cannot realize automatic cyclic shear test, so it cannot simulate the cyclic shear behavior of the contact surface between geomembrane and soil under cyclic loading

[0005] 2) When the existing geogrid cyclic shearing instrument is used for the cyclic shear test of the geomembrane, it can only realize the cyclic shearing of the single-sided contact between the geomembrane and the soil, and cannot simulate the reality of the double-sided contact between the geomembrane and the soil in actual engineering. Happening

[0006] 3) Existing geomembrane or geogrid contact surface direct shear instruments mostly use rigid rods to push the shear box to provide shear loads, and the friction at the joint between the rigid rod and the shear box will cause test errors

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