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Composite soil body compression-shearing fracture failure test method and test device

A composite fracture and destructive test technology, applied in the direction of testing material strength by applying stable shear force, testing material strength by applying stable tension/compression, etc., can solve the problem that it is difficult to obtain continuous distribution characteristics of compressive shear combined force and soil sample strain and critical stress relationship, etc., to achieve good continuous distribution characteristics and simple operation process

Inactive Publication Date: 2014-01-01
CHONGQING JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, even so, it is still difficult to obtain the relationship between the combined compressive shear force, soil sample strain and critical stress with a good continuous distribution characteristic in practice.

Method used

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  • Composite soil body compression-shearing fracture failure test method and test device
  • Composite soil body compression-shearing fracture failure test method and test device
  • Composite soil body compression-shearing fracture failure test method and test device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The soil compression-shear composite fracture failure test method comprises the following steps:

[0034] 1) Prepare the tested sample, which is a cubic soil block, including a top surface, a bottom surface and four sides; when placed, make the top surface of the cubic soil block perpendicular to the horizontal plane, and the bottom surface of the cubic soil block It is also perpendicular to the horizontal plane; in the test, the cubic soil block can be rotated arbitrarily, but it is necessary to keep the state that the top and bottom surfaces of the block are perpendicular to the horizontal plane.

[0035] 2) A slit is made on one side of the tested sample, that is, the tested sample is slit on one side. The method of opening the slit can adopt the common method for preparing soil samples in this field, such as cutting with a knife edge.

[0036] 3) Place the first loading plate and the second loading plate on both sides of the tested sample.

[0037] There are two s...

Embodiment 2

[0045] This embodiment provides a device capable of implementing the method described in Embodiment 1.

[0046] The soil compression-shear composite fracture failure test device includes a first loading plate 5 and a second loading plate 9 with the same shape, and the first loading plate 5 and the second loading plate 9 are respectively located above and below the tested sample. The tested sample is a cubic soil block having a top surface, a bottom surface, a first side, a second side, a third side and a fourth side, and the top surface and the bottom surface are perpendicular to the horizontal plane. In this embodiment, the upper end of the first loading plate 5 can be connected to the mechanical loading device, and the lower end of the second loading plate 9 can also be connected to the mechanical loading device.

[0047] see image 3 , the tested sample is marked as number 6 in the figure, the two sides of the third side of the tested sample 6 are respectively adjacent to ...

Embodiment 3

[0057] This embodiment provides a device whose shape and structure are exactly the same as image 3 , 4 As shown in and 5, the method described in embodiment 1 can be preferably realized.

[0058] The soil compression-shear composite fracture failure test device includes a first loading plate 5 and a second loading plate 9 of the same shape, the first loading plate 5 is located above the sample to be tested, and the second loading plate 9 is located below the sample to be tested. The tested sample is a cubic soil block (same as the sample prepared in Example 2) having a top surface, a bottom surface, a second side, a first side, a third side and a fourth side.

[0059] Both the first loading plate 5 and the second loading plate 9 are rigid plates with a certain thickness. Preferably, the thickness of the first loading plate 5 and the second loading plate 9 in the horizontal direction is greater than or equal to the edge length of the tested sample. In this embodiment, the u...

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PUM

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Abstract

The invention discloses a composite soil body compression-shearing fracture failure test method and test device. The method comprises the steps as follows: 1, preparing a sample to be tested, wherein the top surface and the bottom surface of the cubic soil block are perpendicular to the horizontal plane; 2, forming a gap in one side surface of the sample to be tested; 3, placing a first loading plate and a second loading plate at the upper part and the lower part of the sample to be tested; 4, simultaneously applying acting forces which point to the direction of the sample to be tested and are perpendicular to the horizontal plane to the first loading plate and the second loading plate. The test device provided by the invention comprises the first loading plate and the second loading plate which are the same in shape and are respectively positioned at the upper part and the lower part of the sample to be tested.

Description

technical field [0001] The invention relates to the technical field of soil fracture testing, in particular to a soil fracture failure test method and a test device, in particular to a soil compression and shear composite fracture failure test method and test device. Background technique [0002] Fracture is a failure process caused by the initiation of new cracks or the expansion of existing cracks, and is one of the failure modes of materials and structures. Over the past forty years, developments in fracture mechanics of brittle and quasi-brittle materials have largely focused on concrete, while at the same time establishing their rightful place in geotechnical engineering. The application of fracture mechanics has shown that fracture mechanics can provide powerful tools for investigating and solving many applied problems in rock mechanics and geotechnical engineering. [0003] Cracks in soil are a natural phenomenon and are frequently encountered in many natural and man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/24
Inventor 张慧萍王俊杰温雨眠刘明维
Owner CHONGQING JIAOTONG UNIVERSITY
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