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Strain-control type tension-shearing direct shear apparatus

A technology of strain control and direct shear instrument, which is applied in the direction of testing material strength by applying stable shear force and testing material strength by applying stable tension/compression, which can solve the problem of not reflecting the strength characteristics of soil well and not having Directly measure the shear displacement device, increase the workload of experimenters and other problems, and achieve the effect of simple structure, reliable data and convenient operation

Active Publication Date: 2015-06-17
XIAN CHANGQING TECH ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing research results show that the linear strength criterion cannot reflect the strength characteristics of the soil under the combined tension-shear stress state. Therefore, it is necessary to study the shear strength of the soil in the tension-shear combined stress region
Due to the traditional test technology, it is very difficult to use the direct shear instrument to carry out the experimental research on the tensile and shear stress strength of soil indoors.
[0005] In addition to the axial pressure, most direct shear instruments do not directly measure the shear displacement device, but calculate the shear displacement by recording the number of rotations of the handwheel and the readings of the force ring. Sometimes the rotation speed of the handwheel is too fast , it is easy to cause reading errors, and also increases the workload of experimenters

Method used

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  • Strain-control type tension-shearing direct shear apparatus
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  • Strain-control type tension-shearing direct shear apparatus

Examples

Experimental program
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Embodiment 1

[0034] In order to measure the shear strength of the soil in the tension-shear region and realize the direct shear test in which the axial load is the tensile force, this embodiment provides a method such as figure 1 , figure 2 , image 3 and Figure 4 The strain-controlled tension-shear direct shear instrument includes a base 1 and a bracket 19 fixed on the base 1, and the base 1 is fixedly installed with a push seat 2, a sliding frame 29, and a measuring ring bearing in sequence from left to right. 24. Measuring ring part 25 and lock nut 26; a gearbox 12 is fixedly installed on the support on one side of the push seat 2, and a handwheel 3 is installed on one side of the push seat 2, and the push seat 2 and the gearbox Between 12, a bolt frame 13 is fixedly installed, and a bolt 11 is installed on the upper end of the push seat 2, and a lower shear box 31 is installed at the axial center of the upper surface of the sliding frame two 29, and the front end of the push seat 2...

Embodiment 2

[0039] On the basis of Example 1, such as Figure 5 As shown, the base 1 is fixedly equipped with a sliding frame one 27 by fixing bolts 32, the bracket 19 is installed in the sliding frame one 27, and the sliding frame one 27 is embedded with a roller shaft composed of a row of balls 28, and the sliding frame one 27 Not only as a working platform for the axial loading device, but also provide rollers to reduce the friction between the support 19 and the sliding frame 1 27, so that the axial loading device moves with the horizontal movement of the sample 30 during the shearing process, Avoid eccentric axial loading during testing.

[0040] Such as Figure 6 As shown, the connecting seat 21 is made of plexiglass, and there is a triangular groove in the center of its upper surface, and there are two protrusions with screw holes on both sides of the groove, and a plurality of drainage holes 33 are arranged inside the connecting seat 21 , for drainage during shearing.

[0041] ...

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Abstract

The invention particularly provides a strain-control type tension-shearing direct shear apparatus. The strain-control type tension-shearing direcot shear apparatus comprises a base and a bracket, wherein the base is provided with a horizontal-force applying device, a measuring device, an upper shearing box and a lower shearing box; the bracket is provided with an axial-tension loading device; the horizontal-force applying device consists of a pushing seat, a speed changing box, a sliding frame II, a force-measuring ring bearing, a force-measuring ring part and a locking nut; the measuring device comprises a force measuring ring, a horizontal displacement meter and a vertical displacement meter; and the axial-tension loading device mainly comprises a pneumatic control adjusting device, an air-pressure chamber, a force transferring rod, a piston and a connecting seat. The strain-control type tension-shearing direct shear apparatus provided by the invention has the advantages that the modes of electric-control horizontal loading and axial loading of the air-pressure transferring force are adopted; by a horizontal-force applying device, the measuring device and the axial-tension loading device, stable-force application on a test sample is realized; and the structure is simple, the operation is convenient, the control is stable and the data is reliable.

Description

technical field [0001] The invention relates to a test device for measuring the shear strength of soil, in particular to a strain-controlled tension-shear direct-shear instrument. Background technique [0002] A large number of tests and engineering failure studies have shown that the failure form of soil is mainly shear failure, that is, the strength of the soil is not enough to resist the shear stress on a certain surface. The shear strength has always been the most important research in rock and soil mechanics. One of the topics, and shear failure is the cause of most geotechnical engineering instability, and accurate determination of shear strength parameters of rock and soil is of great significance in geotechnical engineering construction. [0003] At present, the commonly used methods for determining shear strength parameters include triaxial test and direct shear test. Among them, the direct shear test is the most widely used because of its simple operation and wide ...

Claims

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Application Information

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IPC IPC(8): G01N3/10G01N3/24
Inventor 骆建文王治军李荣建耿生明刘军定吴军张宏杰赵胜杰朱桥川刘加文
Owner XIAN CHANGQING TECH ENG
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