Horizontal triaxial tension and compression tester

A technology of triaxial tension and compression tester, which is applied in the direction of applying stable tension/compression to test the strength of materials, etc. It can solve the problems of small axial connection stiffness, inability to eliminate the influence of soil self-weight, and difficulty in measuring the whole process curve of soil, etc. problems, to achieve the effect of large connection stiffness, simple and clear stress conditions, and large axial stiffness

CN101614638AInactive Publication Date: 2009-12-30TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2009-12-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a horizontal triaxial tension and compression tester comprising an AC machine arranged on a test platform. The power output end of the AV machine is connected with a rigid load bar on which a force sensor is arranged; the rigid load bar is connected with a front piston rod; the front piston rod is also provided with a displacement sensor; the force sensor, the displacement sensor and a data acquisition board are connected with a computer; the other end of the front piston rod is connected with a sample cap after passing through a front baffle board, and the sample cap is connected with an air exit hole on the front baffle board by a plastic soft tube; the other end of a rolling bearing on a horizontal stand is also provided with a sample cap which is connected with a rear piston rod; the rear piston rod is connected with a fixed baffle board after passing through a rear baffle board; the AC machine is started, and then an acquisition program carries out real-time acquisition and preserves output values of the force sensor and the displacement sensor; a drain hole is opened, and then a sample is removed after water is completely discharged; and subsequently, the width of a sample tension failure zone is measured. The invention has the characteristics of good integrity, high stability of loading and high axial rigidity.
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Description

Technical field

[0001] The invention relates to a tension and compression tester, in particular to a horizontal three-axis tension and compression tester. Background technique

[0002] The tensile strength and ultimate tensile strain of compacted clay are very important tensile characteristic parameters for crack evaluation of geotechnical structures. Understanding the tensile properties and failure mechanism of compacted clay is of great significance to the safety evaluation of earth-rock dam projects. For example, tension cracks are a common hidden danger and main type of damage in earth-rock dam engineering. The transverse tension cracks on the dam surface caused by uneven settlement and the hydraulic fracturing cracks in the core wall caused by the wedge water pressure are the main types of tension cracks in earth-rock dams. These cracks will cause the destruction of the impervious body of the earth-rock dam. Therefore, the study of the stress-strain relationship, strength ch...

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Embodiment Construction

[0021] The structural principle and working principle of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0022] See figure 1 , 2 , A horizontal three-axis tension and compression tester, including a test platform 16, the test platform 16 is provided with an AC motor 1 as a loading device, the maximum axial force provided by the AC motor 1 can reach 300kg each in tension and compression, and the maximum load The displacement range is ±20mm, and the loading deformation rate is 0.00155mm / min~0.375mm / min, which can meet the requirements of triaxial tension, compression and compression-tension combined tests on soil under general conditions. The power of AC motor 1. The output end is connected with the rigid loading rod 5, which can achieve uniform and stable loading in both directions. The rigid loading rod 5 is provided with a force sensor 2 which is connected to one end of the front piston rod 6, and the front piston ...