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Coarse soil direct shear instrument

A direct shear, coarse-grained soil technology, applied in instruments, scientific instruments, measuring devices, etc., can solve problems such as distortion and error, and achieve the effect of eliminating distortion and error

Inactive Publication Date: 2006-03-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of distortion and error caused by the deviation of the center position of the shear plane in the existing coarse-grained soil direct shear instrument during use, the technical problem to be solved by the present invention is to provide an Coarse-grained soil direct shear instrument without offset

Method used

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  • Coarse soil direct shear instrument
  • Coarse soil direct shear instrument
  • Coarse soil direct shear instrument

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Effect test

Embodiment

[0022] Example: as shown in Figure 1, Figure 2, image 3 , Figure 4 , Figure 5 , Image 6 , Figure 7 As shown, the coarse-grained soil direct shearing instrument of the present invention includes a base 1, a lower shearing box 2, an upper shearing box 3, a pressure transfer plate 4, a rolling support 5, a horizontal loading device 9 and a vertical loading device 7 installed on the beam 6 , the load loaded by the vertical loading device 7 is controlled by a sensor 31 measuring the relative displacement between the lower shear box 2 and the upper shear box 3 . By using the measured value of the displacement, the reduction value of the shear area can be obtained indirectly, which can be used to control the loading force of the vertical loading device, so that the vertical normal stress can be kept dynamically constant.

[0023] The vertical loading device 7 adopts a hydraulic oil cylinder, and the displacement signal measured by the displacement sensor 31 is calculated and ...

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Abstract

The invention discloses a kind of strain-control and stress-control large coarse-grained soil direct cutter for testing the shear strength of coarse-grained soil. It includes a base, the subjacent cutting box, and the upper cutting box, the pressure transmitting board, the rolling supporter, the parallel loading device and the vertical loading device on the beam. The size of vertical load dvice is controlled by the shift sensor for testing the shift of the two boxes. It can acquire the decreasing value of the cut area by the shift value, in order to control the size of force of the vertical loading device, it can maintain the vertical positive stress constant dynamically.

Description

technical field [0001] The invention relates to a device for testing the shear strength of coarse-grained soil, in particular to a large-scale coarse-grained soil direct shearing instrument of strain control type and stress control type. Background technique [0002] At present, the direct shear test is the traditional technical means to test the shear strength parameters of rocks and soils. However, due to the traditional coarse-grained soil direct shearing instrument, one of the upper and lower shear boxes is generally fixed (usually the upper box), and the other is movable. When using the traditional coarse-grained soil direct shearing instrument to test the shear strength of rock, soil, etc., with the occurrence and development of shear displacement during the test process, the shear displacement gradually increases, and the movable shear box gradually deviates from the original position, the center of the shear plane is shifted and the area of ​​the shear plane is grad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/00G01N3/08
Inventor 徐进贾成功
Owner SICHUAN UNIV