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Fixing frame for preventing relative inclination of upper and lower shearing boxes in direct shear test

A technology of shearing box and fixing frame, which is applied in the field of fixing frame, can solve the problems such as large deviation of shear strength, and achieve the effect of low cost, cheap and easy-to-obtain materials, and easy promotion

Inactive Publication Date: 2016-07-20
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The shear strength obtained in this way deviates greatly from the theoretical strength value

Method used

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  • Fixing frame for preventing relative inclination of upper and lower shearing boxes in direct shear test
  • Fixing frame for preventing relative inclination of upper and lower shearing boxes in direct shear test
  • Fixing frame for preventing relative inclination of upper and lower shearing boxes in direct shear test

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0013] A fixed frame, the fixed frame includes a bearing 4 and a fixed rod 5, the lower surface of the bearing 4 is in good contact with the upper surface of the upper shear box 3 of the direct shear instrument, and the fixed rod 5 and the bottom plate 6 of the direct shear instrument are rigidly fixed with bolts At the same time, the upper shear box 3 and the cover plate 7 of the direct shear instrument are heightened, so that the cover plate 7 is in good contact with the upper shear box 3, and no inclination will occur, so as to prevent the bias deformation of the sample 8 during the test ; At the same time, because the bearing 4 can rotate freely, the horizontal displacement of the shear box can occur; but because of the limitation of the fixed rod 5, the vertical displacement of the bearing 4 cannot occur, thereby limiting the upper shear box 3 and the lower shear box 2. Relatively inclined vertically.

[0014] The specific steps of using the fixing frame of this embodimen...

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PUM

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Abstract

The invention discloses a fixing frame for preventing relative inclination of upper and lower shearing boxes in a direct shear test. The fixing frame comprises a bearing and a fixing rod, wherein the lower surface of the bearing is in excellent contact with the upper surface of the upper shearing box of a direct shear instrument; the fixing rod is rigidly fixed with a base plate of the direct shear instrument through a bolt; the upper shearing box and a cover plate of the direct shear instrument are heightened; the cover plate is in excellent contact in the upper shearing box and is impossible to incline and sample bias deformation in a test process is avoided; the bearing can freely rotate, so that the shearing boxes can displace along the horizontal direction; due to the limitation of the fixed rod, the bearing cannot vertically displace and the upper and lower shearing boxes are limited to relatively incline along the vertical direction. The fixing frame provided by the invention has the advantages of low-cost and easily available raw materials, low cost and convenience in popularization; the fixing frame can be used for effectively preventing the upper and lower shearing boxes from relatively reclining in the direct shear test and for improving test precision.

Description

technical field [0001] The invention belongs to the field of civil engineering, and in particular relates to a fixing frame for preventing relative inclination of upper and lower shear boxes in a direct shear test. Background technique [0002] Direct shear test is a common method for indoor determination of soil shear strength. This method is quick and convenient, and the results are easy to process. It is widely used in scientific research and engineering practice. Currently mainly used figure 1 The direct shear test is performed with the lever type direct shear apparatus shown. Due to the defects of the direct shear instrument itself, the vertical pressure Fv is not always perpendicular to the shear plane during the test of this type of direct shear instrument, but has an included angle a with the vertical, such as figure 2 shown. And as the vertical pressure Fv increases, the included angle a also increases. The shear strength obtained in this way deviates greatly f...

Claims

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Application Information

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IPC IPC(8): G01N3/02G01N3/24
CPCG01N3/02G01N3/24G01N2203/0003G01N2203/0025
Inventor 吕海波董均贵刘文斌樊永华李风勇林飞扬梁埔源
Owner GUILIN UNIVERSITY OF TECHNOLOGY