Horizontal triaxial tension and compression tester

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.

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...

AI Technical Summary

Problems solved by technology

In terms of triaxial tensile test instruments, it is generally obtained by refitting existing conventional triaxial compression instruments. The axial connection stiffness is small, and it is difficult to measure the whole process curve of soil tensile stress and strain.

In addition, because the sample is placed vertically, the influence of soil self-weight cannot be eliminated under small confining pressure

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