Apparatus and method for soil preparation and direct shear test for on-site soil direct shear test

Abstract

The invention discloses a method for preparing a soil body by a soil body preparation device for in-situ direct shear test of a soil body. The soil body preparation device comprises a preparation assembly and a loading assembly, wherein the preparation assembly comprises a bottom frame, a bottom plate, a telescopic component and an upper shearing box, the telescopic component is hinged onto the bottom frame, the bottom plate is movably mounted in the bottom frame, and the upper shearing box is located in the telescopic component; the loading assembly comprises a first jack, a force transmission frame, and a fixed frame fixedly connected to the top end of the telescopic component, one end of the first jack is fixedly connected onto the fixed frame, the other end of the first jack abuts against the end surface of the force transmission frame, and one end, away from the first jack, of the force transmission frame abuts against the upper shearing box.

Description

technical field [0001] The invention relates to a device and method for soil preparation and direct shear test for on-site soil direct shear test. Background technique [0002] In recent years, the theory, design, and construction of underground engineering and slope engineering have been deeply studied. Most of the deformation and failure of geotechnical engineering are caused by shear failure. Therefore, the accurate measurement of shear strength parameters of rock and soil Plays a very important role in geotechnical engineering. In the test of the shear strength of rock and soil, the direct shear test has been widely used because of its simple operation method and clear principle. [0003] Due to the limitation of field test conditions and funds, the direct shear test of rock and soil mass is still dominated by laboratory small-scale tests. Its advantage is that the boundary conditions are easy to control, and various methods such as direct shear test, triaxial test, an...

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Problems solved by technology

[0004] However, at present, there are two obvious difficulties in large-scale soil direct shear tests on site. One is the preparation of soil standard samples. The commonly used site soil direct shear test sample size is generally: length × width × height = 500mm×500mm×300mm

During the field test, a large sample soil (length, width, and height are all greater than 500mm) is generally excavated at the selected test site, and then the sample is manually prepared with tools such as a soil cutter, but the manually prepared sample The geometric dimensions, angles, and flatness are often not standard, and it is difficult to meet the requirements of the test specifications, which directly leads to the discreteness of the test results and affects the accuracy of the test results; on the other hand, it is the normal load application of the direct shear test. , usually using methods such as ground anchors and surcharges. However, the workload of burying ground anchors and applying surcharges is large, and the time and labor costs are high. Therefore, a more convenient method of applying normal loads is urgently needed

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