Large-tonnage uniform distribution concentrated loading system

Abstract

The invention relates to a large-tonnage uniform distribution concentrated loading system used for geomechanics model tests, and belongs to the technical field of geotechnical engineering. The loading system comprises a hydraulic jack group fixedly arranged on a vertical support, a bearing plate, a reaction frame and a base; a guide rack is fixedly arranged on the base; a force transmission column is movable arranged in a horizontal through hole arranged on the guide rack; a force concentrating board is arranged between the jack group and the force transmission column; and a spherical contact is arranged at the front end face of the force concentrating board. The loading system provided by the invention can provide large-tonnage load to meet loading requirements by the model test under deeply-buried high stress; the design of the spherical contact can ensure that the load vertically acts on surface of a model, so as to lead the model to be stressed regularly and improve the accuracy and reliability of results of the model test.

Description

technical field [0001] The invention relates to a large-tonnage, uniformly distributed-concentrated loading system for geomechanical model tests of geotechnical engineering such as tunnels, deep-buried hydropower stations, and deep-buried mines, and belongs to the technical field of geotechnical engineering. Background technique [0002] With the rapid development of China's economy, the country's demand for energy, transportation, national defense and living space is increasing day by day. Then there are some new geomechanical phenomena, such as hard rock rockburst, soft rock large deformation, surrounding rock partition cracking phenomenon, etc., and the mechanism of these phenomena different from shallow rock engineering It is still unclear, and the control effect is not ideal, and the lack of suitable test methods is one of the reasons for the lack of understanding. Because similar material model experiments can simulate the initial stress field of rock mass, simulate v...

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Problems solved by technology

[0007] (1) In the piston-type uniform pressure loader, due to machining accuracy and machining errors, the surface of each small jack may have different undulations and roughness, etc., which will lead to uneven force applied to the model surface; and the output force In the process, it is also difficult to ensure that the output of each jack is exactly the same;

[0008] (2) When the flexible bladder is loaded, there will be problems such as small loading stroke and low load intensity, which cannot meet the loading requirements of large loads;

[0009] (3) Since the applied load must be perpendicular to the surface of the model, otherwise the model will be unbalanced and affect the accuracy of the test results

The third loading method mentioned above will also cause unevenness of the surface of the jack due to the machining error of the surface of the small jack, resulting in uneven force applied to the surface of the model; and each jack is controlled by an independent hydraulic system. The size cannot be guaranteed to be exactly the same, which will lead to uneven stress on the surface of the model, which does not match the actual stress

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