A granular soil shear flow test system
A shear flow, test system technology, applied in the direction of flow characteristics, measuring devices, instruments, etc., can solve the problems of not considering the influence, difficult to provide mechanical characteristics, low shear rate and small strain conditions, etc., to achieve good sealing performance. Effect
Active Publication Date: 2018-07-24
TONGJI UNIV
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Problems solved by technology
At present, shear tests in the field of soil mechanics (such as circular shear tests) are limited to low shear rates and small strain conditions under quasi-static deformation, and are only suitable for studying the stability of soil particle accumulations, and it is difficult to provide The mechanical characteristics of shear flow under large deformation state, and the influence of gravity environment on large deformation shear flow of soil is not considered
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Embodiment １
[0019] A kind of granular soil shear flow test system, its structure is as follows figure 1 As shown, the system includes a computer 1 , a data acquisition card 2 , a shear test device 3 and a camera device 4 . The computer 1 is connected to the acquisition card 2 through the USB interface, the acquisition card 2 is connected to the shear test device 3 through the signal transmission terminal, and the camera device 4 is located above the shear box in the shear test device 3 . The shear test device 3 is the main part of the test system, which can realize the shear flow of the granular material at a relatively high shear rate. The test data is automatically collected through the data acquisition card and transmitted to the computer display interface. The camera device realizes the image acquisition of the particle shear flow process.
[0020] The structure diagram of the shear test device is shown in figure 2 As shown, the main power equipment (deceleration motor) 5 of the d...
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The invention relates to a granular soil shear flow test system. The test system comprises a shear test device, an image pickup device and a data acquisition device, etc. Specifically, the shear test device is the main part of the test system, is mainly composed of a deceleration motor, a dynamic torque sensor and a shear box, etc, and can realize shear flow of granules. Test data can realize automatic acquisition and display through cooperation of a data acquisition card with a computer terminal, and the image pickup device achieves the whole-course image acquisition of a shear flow process. Compared with the prior art, the test system provided by the invention can realize shear flow of granular soil under a high shear rate, and can acquire the mechanical behavior of granules under different test conditions (volume fraction and boundary conditions, etc) and in shear flow processes at different shear rates. Also, the shear box involved in the system has good sealing performance overall, can carry out shear flow of granular soil under conventional gravity (1g) and density match based micro(weak) gravity environment, and can be used for studying the influence of gravity environment on granule shear flow characteristics.
Description
technical field [0001] The invention relates to a shear test system for granular soil in the technical field of engineering geology, in particular to a shear flow test system for granular soil. Background technique [0002] Soil materials are widely expressed as granular aggregates, such as sandy soil, coarse-grained soil, gravel soil, etc., including lunar soil and planetary surface soil in outer space, which are also typical granular materials. When a granular system is subjected to an external force, it often exhibits fluid-like properties, and this phenomenon is called particle flow. Geological disasters such as collapses, landslides, debris flows, and space debris flow all involve the flow behavior of granular materials, and these disasters often occur in equivalent weak gravity or space micro (weak) gravity environments. To study the shear flow of granular soil Characteristics have very practical significance for geological disaster prevention and space science resear...
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IPC IPC(8): G01N11/14
CPCG01N11/14
Inventor 黄雨范冠博朱崇强
Owner TONGJI UNIV