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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 vertical normal stress increase, and achieve the effect of distortion and error elimination

Inactive Publication Date: 2004-09-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the deficiency that the shear area of ​​the existing coarse-grained soil direct shear instrument gradually decreases with the occurrence of shear displacement during the test, resulting in the gradual increase of the vertical normal stress with the decrease of the shear area. The technical problem to be solved by the invention is to provide a direct shear instrument for coarse-grained soil in which the vertical normal stress remains constant during the test.

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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Embodiment

[0024] Embodiment: as shown in Figure 1, Figure 2, image 3 , Figure 4 , Figure 5 , Image 6 , Figure 7 As shown, the coarse-grained soil direct shear instrument of the present invention includes a base 1, a lower shear box 2, an upper shear box 3, a pressure transmission 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 the sensor 31 for measuring the relative displacement between the lower shear box 2 and the upper shear box 3 . The measured value of the displacement is used to indirectly obtain the reduction value of the shear area, which is used to control the loading force of the vertical loading device, so that the vertical normal stress can be dynamically kept constant.

[0025] The vertical loading device 7 adopts a hydraulic oil cylinder, and the displacement signal measured by the displacement sensor 31 is calculated and processe...

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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 strain-controlled and stress-controlled large-scale direct shear instrument for coarse-grained soil. Background technique [0002] At present, the direct shear test is a traditional technique for testing the shear strength parameters of rocks and soils. Yet because traditional coarse-grained soil direct shear instrument general upper and lower shear box, one is fixed (usually upper box), and the other is movable. When the traditional coarse-grained soil direct shear instrument is used to test the shear strength of rocks and soils, during the test, with the occurrence and development of the shear displacement, the shear displacement gradually increases, and the movable shear box gradually deviates from the original position. position, the center of the shear plane shifts and the area of ​​the shear plane shrinks gradually, while the position of t...

Claims

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Application Information

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IPC IPC(8): G01N3/00G01N3/08
Inventor 徐进贾成功
Owner SICHUAN UNIV