Site direct-shearing rheological testing method and device
A rheological test and on-site technology, applied in the direction of testing material strength by applying stable shear force, testing material strength by applying stable tension/pressure, etc., to achieve full utilization of on-site resources, reliable performance, and simple operation
Active Publication Date: 2014-11-05
CENT SOUTH UNIV +2
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Problems solved by technology
However, as we all know, most rocks and soils are damaged by shearing, and the direct shear test can more intuitively reflect the failure mechanism of rocks and soils. The difficult problem of rheological tests is how to provide stable pressure.
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Embodiment Construction
[0016] The specific implementation of the on-site direct shear rheological test device in the present invention will be described in detail below in conjunction with the accompanying drawings.
[0017] see figure 1 , figure 2 with image 3 , the size of the earth column 1 is greater than 50cm × 50cm, less than 150cm × 150cm, the height of the earth column 1 is half of the side length, side rigid plates 2 are installed around the earth column 1, and the top of the earth column 1 is covered The top rigid plate 6 with the first tripod 7 is welded, and a side pressure cell 3 is pre-embedded on the horizontal shear loading side for testing the horizontal compressive stress, and a top pressure cell 4 is pre-embedded on the top of the earth column 1 for testing the vertical stress. To the pressure, put the horizontal lever 9 on the first tripod 7, one end of the horizontal lever 9 is placed under the first fixed bracket 10 as a rotation point, and the first reinforcement cage 11 i...
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The invention discloses a site direct-shearing rheological testing method and device. The site direct-shearing rheological testing method comprises the following steps of; cutting a soil square column in site; covering rigid boards on the four sides and the top of the soil square column; placing a horizontal lever on a triangular rack of the rigid board on the top of the soil square column; hanging a steel reinforcement cage on the other end so as to add a sand pocket; testing the vertical displacement of the top surface of the soil square column under the reaction of a target vertical pressure by adopting a dial indicator; after stabilizing the vertical displacement, exerting a horizontal shearing force, placing a vertical lever beside the rigid board on the loading side of the horizontal shearing force; supporting the bottom end of a lever on the triangular rack of the rigid board on the loading side of the horizontal shearing force; tying a horizontal steel rope on the lever; hanging the steel reinforcement cage below the steel rope; adding the sand pockets grade by grade in the steel reinforcement cage so as to provide the horizontal shearing force; testing horizontal displacement under the reaction of each grade of horizontal shearing force through the dial indicator until the horizontal displacement is tended stably; and adding the sand pockets until the soil square column is damaged. A site direct-shearing rheological testing scheme provided by the invention has the advantages of simple operation, capability of utilizing site resources and relatively lower testing cost.
Description
technical field [0001] The invention relates to an on-site direct shear rheological test method, which is especially suitable for strata such as hard soil (or soft rock) in tunnels, and also relates to a device for realizing the method. Background technique [0002] As the transition medium between soil and rock, hard soil and soft rock have complex geomechanical properties, and they often exhibit rheological properties. With the development of infrastructure, a large number of tunnels, bridge foundations and roadbeds built on hard soil or soft rock have emerged. In order to ensure the safe use of infrastructure, it is necessary to study the rheological properties of hard soil and soft rock to provide guidance for design and construction. The advantage of the field test is that the rock and soil are less disturbed, and it is easy to maintain its original microstructure. At present, domestic on-site rheological tests are mainly carried out on the basis of load plate tests, ...
Claims
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IPC IPC(8): G01N3/24G01N3/08
Inventor 王树英阳军生杨峰张学民周海英邹家鸿肖小文
Owner CENT SOUTH UNIV