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Movable plate stacking ring shearing apparatus capable of adapting to free shearing deformation

A shear deformation and movable plate technology, which is applied in the direction of using a stable shear force to test the strength of materials, can solve the problems of uneven distribution of stress and strain in the sample, concentration, and existing stress, and the distribution is uniform and reduced. The effect of restraint and reduction of stress concentration

Active Publication Date: 2015-08-19
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to improve defects such as uneven distribution of stress and strain in the sample and stress concentration on the boundary in the shear test, the present invention provides a movable plate stacked ring shearer that can adapt to free shear deformation, which can perform single shear test, direct Shear test, pull-out test of geogrid, geotextile, etc. can also be carried out

Method used

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  • Movable plate stacking ring shearing apparatus capable of adapting to free shearing deformation
  • Movable plate stacking ring shearing apparatus capable of adapting to free shearing deformation
  • Movable plate stacking ring shearing apparatus capable of adapting to free shearing deformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment one: simple shear test

[0041] When performing the simple shear test, first assemble the parts of the lower shear box, apply a layer of lubricating oil evenly in the box, pour concrete, and place it on the vibrating plate to vibrate and compact. After the concrete is finally set, stack the ring shearing frames on the lower shear box, fix each ring shearing frame through bolts, and install the guard plate of the movable plate to fix the movable plate. Compact the soil samples layer by layer in the shear box of the stacked ring group, and flatten the top of the sample. Assemble the remaining parts of the device in turn, apply lubricating oil on the bottom surface of the pressure transmission plate, and place it on the soil sample. Adjust the vertical force loading device so that the pressure head of the loading device is against the upper top plate. Install the horizontal reaction force plate, inclined support plate, horizontal force loading device, top cap,...

Embodiment 2

[0044] Embodiment two: direct shear test

[0045] When conducting the direct shear test, it is necessary to remove the movable plate and bearings in the shear frame of the stacked ring, and plug the openings for placing the bearings on the left and right wings of the shear frame of the stacked ring. Fill the lower shear box with concrete materials, and after the concrete has finally set, stack the ring shear frame on the lower shear box and fix it with a bolt. After the sample preparation in the shear box of the stacked ring group is completed, the various components of the test equipment are assembled in sequence as in the simple shear test.

[0046] After the normal pressure is applied by the vertical force loading device, the horizontal force loading device applies the shear force, the normal pressure and shear force are collected by the load sensor, and the displacement of the lower shear box is collected by the displacement sensor.

Embodiment 3

[0047] Embodiment 3: pull-out test

[0048] When carrying out the pull-out test, the concrete material is placed in the lower shear box. After the concrete is finally set, the stacked ring shear frame is stacked on the lower shear box, and the geogrid, geotextile, etc. are sandwiched between the second, Between the third stacked ring shear frame, the second and third shear frames are fixed with bolts. After the sample is prepared, other parts of the test equipment are assembled in sequence. There are special vertical top caps and roof. The geogrid or geotextile is fixed on the horizontal reaction plate with a clamp, the vertical force loading device applies normal pressure to the sample through the top plate, and the horizontal force loading device applies horizontal shear force to the sample through the lower shear box. The normal pressure and shear force are collected by the load sensor, and the displacement of the lower shear box is collected by the displacement sensor.

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Abstract

The invention discloses a movable plate stacking ring shearing apparatus capable of adapting to free shearing deformation and belongs to the mechanical characteristic test equipment. The movable plate stacking ring shearing apparatus comprises a bracket, a lower shearing box, a stacking ring set shearing box, a vertical loading unit, a horizontal loading unit and a measuring unit, wherein the bracket consists of a bottom plate and a stand column; the lower shearing box and the stacking ring set shearing box are stacked between the bottom plate and the vertical loading unit in sequence; the vertical loading unit is fixed on the stand column; the horizontal loading unit is fixed on the bottom plate. According to the movable plate stacking ring shearing apparatus capable of adapting to free shearing deformation, a movable plate shearing frame capable of adapting to free shearing deformation can be used for performing a simple shear test and a direct shear test and also can be used for performing a pull-out test on geogrid, geotechnical cloth and the like. When the simple shear test is performed, the vertical loading unit can provide three normal boundary conditions of normal displacement, normal rigidity and normal stress, and the horizontal loading unit can be used for providing horizontal shearing force. The movable plate stacking ring shearing apparatus is delicate in design, convenient to operate, easy to assemble and disassemble, and capable of precisely performing research on shearing deformation characteristic between contact surfaces of geotechnical materials and structures.

Description

technical field [0001] The invention relates to the technical field of civil engineering shear test instruments, in particular for the study of shear characteristics of contact surfaces, in particular to a movable plate stacked ring shear instrument which can adapt to free shear deformation. Background technique [0002] The shear test is an important means to study the characteristics of the contact surface and an important way to reveal the deformation law of the contact surface. Direct shear and single shear shear test equipment are the most widely used in shear tests. [0003] The direct shear instrument is simple in structure and easy to operate. When preparing samples, soil samples are placed in the upper shear box, and concrete and other structures are poured in the lower shear box. During the test, the lower shear box is usually fixed, and the upper shear box is pushed or pulled to generate horizontal displacement. During the test, the vertical force is generally ...

Claims

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Application Information

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IPC IPC(8): G01N3/24
Inventor 傅旭东黄斌张本蛟邱子锋梅灿罗刚饶军肖磊周颖
Owner WUHAN UNIV
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