Large-size high-precision simple shear apparatus structure

Abstract

The invention relates to the technical field of hydraulic and civil engineering, particularly a large-size high-precision simple shear apparatus structure which comprises a base platform, wherein a metal plate is arranged on the base platform; the upper surface of the metal plate is integrally connected with guide plates; rolling shafts are arranged between the guide plates; a concrete block is previously arranged above the rolling shafts; the upper part of the concrete block is provided with laminated plates; the laminated plates are provided with locating holes and locating bolts; a sample placement bin is provided with a pressure transfer plate; a supporting frame is arranged across the base platform; the supporting frame comprises two support columns; a support cross bar, which is arranged across the base platform and positioned above the laminated plates, is fixed between the support columns; the position on the lower surface of the support cross bar adjacent to the center is fixed with a vertical lifting jack; one side of the base platform adjacent to one end of a guide channel is provided with a transverse lifting jack; one side of the laminated plates opposite the transverse lifting jack is provided with a load sensor and a displacement meter; and a normal load sensor is arranged above the upmost laminated plate. The large-size high-precision simple shear apparatus structure has the advantages of firm structure, stable operation and high test accuracy, and is convenient to operate.

Description

technical field [0001] The invention relates to the technical field of water conservancy and civil engineering, in particular to a large-scale high-precision single-shear instrument structure. Background technique [0002] At present, when studying the mechanical properties of soil, soil and structure contact surface, the simple shear instrument is mostly used for testing. For example, the Chinese invention patent with the publication number of 102269676A discloses a high-precision geotechnical simple shear instrument and its use method. A groove is provided on the outer wall of each shear ring in the stacked ring group, and multiple horizontal displacement sensors are arranged in the horizontal displacement sensor box to connect with the lower shear box and the upper shear stacked ring group; two The vertical displacement sensor; the horizontal electromagnetic exciter is fixed on the base through a jack; a level pipe is arranged on the horizontal dowel bar connecting the l...

AI Technical Summary

Problems solved by technology

When in use, it is ensured that the shear force is applied in the horizontal direction through jack adjustment and level pipe monitoring; the shear displacement generated by the lower shear box and each shear ring in the upper shear stack ring group is collected through the horizontal displacement sensor box; through two A vertical displacement sensor collects the normal displacement of the sample in the upper shear stack ring group under the action of cyclic shear force. The structure is simple, and it is easy to measure the deformation characteristics of the contact surface between the soil and the structure, especially in earthquakes. The frictional static test of the sand cushion under study requires a large experimental force. When the structure is in use, there will be many interference factors that affect the measurement results, such as the shaking caused by the shear box and the inner structure. When the position is subjected to shear force, it will produce position deviation and interference with the force between the stacking ring. The design of the stacking ring itself makes the error generated when the horizontal or vertical direction is aligned and the force is not uniform during the stress process. Errors, friction resistance between the upper and lower stacked rings affect the measurement results during the measurement process, problems such as normal pressure and horizontal shear force deflection caused by the structure of the instrument during the test process affect the measurement results, etc. Factors, the final error will be large, the accuracy is not high enough, and due to the design of the instrument's own structure, the operation will be unstable and prone to damage, thereby shortening the service life; in addition, the structure itself is small in size and cannot be placed Very large structures and a large number of soil samples are more suitable for small shear tests than large shear tests

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