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Drawing and shear testing device for geosynthetics

A geosynthetic material, shear test technology, applied in the direction of testing material strength by applying stable shear force, testing material strength by applying stable tension/compression, etc., to achieve the effects of simple manufacture, high measurement accuracy and convenient use

Inactive Publication Date: 2014-05-07
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a geosynthetic material pull-shear test device to solve the test problem of the pull-out resistance and shear resistance of geosynthetics in porous media including sand, silt or cohesive soil

Method used

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  • Drawing and shear testing device for geosynthetics
  • Drawing and shear testing device for geosynthetics
  • Drawing and shear testing device for geosynthetics

Examples

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Embodiment

[0027] (1) The steps of using the device to carry out the pull-out test of geosynthetics are as follows:

[0028] ① Install the lower sample box 13 in the lower base 14, put the lower permeable stone 18 into the lower sample box 13, lay filter paper on the surface of the lower permeable stone 18, lay the lower sample 26 on the filter paper, and lay filter paper on the surface of the lower sample 26 , the upper permeable stone 11 is installed on the filter paper, the top cover 8 is installed on the upper permeable stone 11, and the top cover 8 is connected to the pressurized shaft 10;

[0029] ② Apply a weight 25 to provide a consolidation pressure of 100kPa for the lower sample 26, so that the lower sample 26 is consolidated, exhaust and drain through the upper drainage hole 7 and the lower drainage hole 17, and the indication value of the displacement meter 31 to be consolidated is less than Or equal to 0.01mm / h and when the surface layer of the lower sample 26 after consolid...

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Abstract

The invention discloses a drawing and shear testing device for geosynthetics. The drawing and shear testing device is characterized by comprising a drawing stepping motor (1), a drawing force measuring ring (2), an upper sample box (6), a pressurizing frame (9), a lower sample box (13), a lower base (14), a shear force measuring ring (15), a shear stepping motor (16), a pressurizing lever (23) and a weight (25), wherein the drawing stepping motor (1) is connected with the drawing force measuring ring (2); the lower sample box (13) is mounted on the lower base (14); a lower sample (26) is arranged on a piece of filter paper; geosynthetics (4) are laid between the lower sample (26) and an upper sample (12); the geosynthetics (4) are fixed through a clamp (3) and a deformable clamp (5); a top cover (8) is arranged on upper water permeating stones (11); upper drain holes (7) are formed in the top cover (8); a cushion block is arranged between the upper sample box (6) and the lower sample box (13); the top cover (8) has contact with a pressurizing shaft (10), and the shear stepping motor (16) is used for providing a shear force by means of pushing the lower base (14). The drawing and shear testing device is simple to manufacture, high in measurement accuracy, convenient to use and capable of being used for measuring the tensile strength and shear strength properties of various geosynthetics in a porous medium in civil engineering or geological engineering.

Description

technical field [0001] The invention relates to a geotechnical test device, which belongs to the technical field of civil engineering (geotechnical) engineering. Background technique [0002] Geosynthetics are widely used in reinforced soil, which can provide balanced stress for rock and soil and form a composite structural system. With the extensive development of geotechnical engineering construction in our country, the reinforced soil technology has been popularized rapidly, and the technical application far exceeds the theoretical research. How to measure the tensile strength and shear strength of geosynthetics in rock and soil, so far there is no suitable experimental equipment for measurement. At present, most of them use the tensile strength and puncture strength of geosynthetics themselves. Indicators are used for design and construction, and a unified strength test specification and operation process have not yet been formed. The application is to invent a test de...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/24
Inventor 李志清
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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