Direct shear tester for field undisturbed soils

Abstract

The invention discloses a direct shear tester for field undisturbed soils, which comprises a shear device, a vertical loading device and a horizontal loading device, wherein the shear device comprises a lower shear box and an upper shear box arranged on the lower shear box in a sliding fit mode; the vertical loading device comprises a loading container I and a force transmission component I for carrying out vertical loading on soil bodies; and the horizontal loading device comprises a loading container II and a force transmission component II for carrying out horizontal loading on the upper shear box; and when in use, the upper shear box and the lower shear box are sleeved around the tested undisturbed soils, then just enough soils and rocks are arranged around the lower shear box so as to fix the lower shear box, the loading container I and the loading container II are respectively filled with field soils and rocks, and shear strength testing is performed on the field undisturbed soils so as to determine the shear stresses of the undisturbed soils under different vertical pressures, thereby deeply learning the changing rule of some mechanical properties of the undisturbed soils so as to provide a theoretical basis for analyzing the stability of a later-stage waste disposal site and designing the emission scheme of chats.

Description

technical field [0001] The invention relates to a test device for shear strength of non-disturbed soil on site, in particular to a direct shear tester for non-disturbed soil on site such as mine dump or coarse-grained soil. Background technique [0002] Because the undisturbed soil has obvious structure, the structure of undisturbed soil has a more significant influence on its mechanical properties. Therefore, it is necessary to measure the mechanical properties of the undisturbed soil in order to gain an in-depth understanding of some mechanical changes of the undisturbed soil, so as to provide more reliable mechanical parameters for the slope stability of dump sites and waste rock sites. [0003] However, the existing non-disturbed soil direct shear tester has the following disadvantages: ① the existing large direct shear tester is generally only suitable for measuring the mechanical properties of disturbed soil indoors; ② using the existing large direct shear tester for v...

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Problems solved by technology

[0003] However, the existing non-disturbed soil direct shear tester has the following disadvantages: ① the existing large direct shear tester is generally only suitable for indoor testing of the mechanical properties of disturbed soil; ② the use of the existing large direct shear tester for vertical and horizontal loading requires the use of special equipment, which is not easy to carry for on-site measurement; ③ the existing large-scale direct shear tester is not conducive to transportation due to its large volume, heavy weight and troublesome loading and unloading, and its cost is high. use in the field

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