Strain-controlled-type unsaturated soil triaxial tensile instrument

Abstract

A strain-controlled-type unsaturated soil triaxial tensile instrument comprises a dynamometer. A pressure chamber is arranged below the dynamometer. A bottom of the pressure chamber is provided with apressure chamber pedestal. The pressure chamber pedestal is arranged on a bench seat. A sample fixing die is arranged on the pressure chamber pedestal in the pressure chamber. A force transmission rod penetrates a top of the pressure chamber and is connected to the top of the sample fixing die. The sample fixing die comprises an upper die and a lower die. Inner walls of the upper die and the lower die are provided with several spines. A lower portion of the upper die is provided with an upper die support. An upper portion of the lower die is provided with a lower die support. The top of the upper die and the force transmission rod are detachably connected. A bottom of the lower die and the pressure chamber pedestal are detachably connected. The upper die support and the lower die supportare contacted and connected. The instrument has advantages that the structure is simple; manufacturing cost is low; precision is high; and popularization is convenient and so on. A unsaturated soil triaxial tensile test can be effectively realized, application of negative confining pressure is achieved, and a favorable reference is provided for improving the triaxial tensile test in a geotechnicaltest.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering tests, in particular to a strain-controlled unsaturated soil triaxial stretcher. Background technique [0002] The failure of many geotechnical structures is closely related to the tensile strength of soil, which is one of the important mechanical indexes of soil. However, compared with the shear strength and compressive strength of soil, the tensile strength of soil is immature from test instruments to theory. At present, most of the existing soil direct tensile test instruments have the disadvantages of high cost, low precision, difficulty in implementation, and inability to measure the suction of soil matrix under the state of tensile stress. Contents of the invention [0003] In view of the technical problems existing in the background technology, the strain-controlled unsaturated soil triaxial extensometer provided by the present invention has the advantages of simple structure, low...

AI Technical Summary

Problems solved by technology

However, compared with the shear strength and compressive strength of soil, the tensile strength of soil is immature from test instruments to theory

At present, most of the existing soil direct tensile test instruments have the disadvantages of high cost, low precision, difficult implementation, and inability to measure the suction of soil matrix under the state of tensile stress.

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