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Stacked ring type shear apparatus and method for testing composite liner material by same

A technology of cushioning materials and shearing instruments, which is applied in the direction of applying stable shear force to test the strength of materials, can solve the problems of unsuitable size effects for various geotechnical materials tests, single test interface, etc., and achieve large sample size , the effect of reducing the error of the instrument

Inactive Publication Date: 2009-12-16
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the defects of the above-mentioned testing instruments: the test interface is single, only direct shear test can be performed, there is a size effect, and it is not suitable for testing various geotechnical materials

Method used

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  • Stacked ring type shear apparatus and method for testing composite liner material by same
  • Stacked ring type shear apparatus and method for testing composite liner material by same
  • Stacked ring type shear apparatus and method for testing composite liner material by same

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The material of the conventional compacted clay liner system was subjected to bulk shear tests using two stacked rings, one for the clay geotextile and one for the geomembrane. The geotextile and the geomembrane are respectively glued to the 1.5mm thick lamination ring in the lamination ring group 7; the sand is placed in the lower shear box 6, and the shear lamination ring glued with the geotextile is placed on the sand. A geonet is placed on it, and the shearing ring that is glued with the geomembrane is placed on the geonet, and finally the compacted clay is loaded into the upper shear box 8 . Connect the hydraulic connecting rod of the horizontal hydraulic cylinder 11 with the lower shear box 6, and tighten the bolts; install the horizontal displacement sensor 13, and align it with the stack ring in the stack ring group 7, and install the vertical displacement sensor 12 , make it contact with the cover plate 9, and check whether the sensor is sensitive; connect the ...

Embodiment 2

[0027] If the direct shear test is carried out, it is not necessary to use the stacked ring, and the stacked ring is replaced with an integral upper shear box for direct shearing. Take the direct shearing of the interface between geonet and geomembrane as an example: because the lower shear box 6 is 120 mm thick, it is impossible to directly stick the geomembrane, so a rigid iron block is added in the lower shear box 6 as a support, and then put on the rigid iron block. A rigid plate, the geomembrane is fixedly glued to the rigid plate; the geonet is glued to another rigid plate, placed in the upper shear box 8, so that the geonet and the geomembrane are in close contact.

Embodiment 3

[0029]Combined interface single shear test, taking the combination of geonet, geotextile and sand as an example, the geonet is glued to the rigid plate and placed in the lower shear box 6, and a rigid iron block is added to support the rigid plate in the lower shear box 6 , the geotextile is glued to the shearing ring with 502 glue (because the geotextile itself is only a few millimeters thick, a 1.5mm stacking ring is used at this time), placed on the geonet, and the sand is filled on the geotextile In the stack ring with a thickness of 20mm in the stack ring group 7.

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Abstract

The invention provides a stacked ring type shear apparatus and a method for testing composite liner materials by the same. The main part of the stacked ring type shear apparatus comprises an upper shear box, a lower shear box as well as a stacked ring group between the lower shear box and the upper shear box, the lower shear box is connected with a horizontal hydraulic cylinder by a hydraulic connecting rod and the bottom of the lower shear box is fixedly connected with a rigid substrate, a roller is arranged between the rigid substrate and a frame pedestal, and the stacked ring lateral wall is contacted with the working end of a horizontal shift sensor. When using the apparatus to test, the composite liner materials to be tested are respectively placed in the lower shear box, the stacked rings or the upper shear box, the uppermost stacked ring or the upper shear box is fixed on the frame, and then the test process is started. The invention breaks the limit that only the shear interface can be fixed when a conventional test apparatus carries out indoor test on a sanitary landfill liner system, and meanwhile the shift of the weakest sliding surface in the sample between earthwork materials contact faces can be observed when testing differently applied vertical load.

Description

technical field [0001] The invention belongs to the technical field of testing the mechanical properties of different geotechnical material combinations, and in particular relates to a shearer for testing the mechanical properties of a composite liner material system in a sanitary landfill and a test method using the shearer for testing. Background technique [0002] The large amount of modern domestic garbage and the shortage of land resources urgently require the establishment of large-scale, high-safety large-scale sanitary landfills. Therefore, under the conditions of high pressure and large slope angle, establishing a mathematical model that can truly reflect the constitutive relationship of the composite lining interface is of great significance for accurately analyzing the stability of large sanitary landfills. The liner system of modern sanitary landfill mainly consists of geomembrane, geotextile, geonet, GCL liner and other geotechnical materials as well as sand and...

Claims

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Application Information

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IPC IPC(8): G01N3/24
Inventor 施建勇钱学德卢廷浩朱月兵刘慧
Owner HOHAI UNIV
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