A triaxial compression grouting test device and method with variable bearing contact area

Abstract

The present invention relates to the cross - technical field of tunnel engineering and geotechnical mechanics testing, and discloses a triaxial compression grouting test device and method with a variable bearing contact area, which includes a cube - shaped specimen; the loading system includes a reaction frame and a plurality of hydraulic rods rotatably connected to the reaction frame through driving members. The output ends of the hydraulic rods are circumferentially connected with a plurality of pressurizing mechanisms, and the output ends of the hydraulic rods are also detachably connected with a plurality of groups of bearing blocks arranged circumferentially. The front surfaces of the plurality of bearing blocks in each group are arranged in an inclined plane in the counter - clockwise direction, and the outer edges of the plurality of bearing blocks in each group gradually shrink in an arc shape. The plurality of pressurizing mechanisms are respectively used to abut against the front surfaces of the plurality of groups of bearing blocks, and the back surfaces of the plurality of bearing blocks are fitted with corresponding multi - layer nested bearing plates, and the bearing plates are used to abut against the end faces of the specimen. The present invention can more realistically restore the stress state of tunnel surrounding rocks, can make the bearing area adaptively adjust as the volume of the specimen decreases, and avoid stress concentration.

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