A mold and test block manufacturing method capable of accurately fixing joint shear test specimens

Abstract

The invention relates to a mold capable of accurately fixing a test piece of a joint shear test and a production method of a test block. The mold comprises a mold main body with an opened upper end, wherein limiting bolt holes are formed in the side surface and bottom surface of the mold main body, and limiting bolts are arranged in the limiting bolt holes; and by respectively regulating the lengths of the limiting bolts, stretching into the mold main body, on the side surface and bottom surface of the mold, the limiting bolts prop against the surfaces of the test piece of the joint shear test, so as to accurately fix the test piece. The production method comprises the steps of firstly respectively accurately fixing an upper-half joint test piece and a lower-half joint test piece by virtue of an upper mold and a lower mold, lengthening a limiting bolt sleeve sleeving the outside of each limiting bolt, filling the mold with mortar, unscrewing each limiting bolt after the initial setting of the mortar, further carrying out maintenance formation, and removing the mold. Compared with the prior art, the mold has the advantages that the test piece of the joint shear test can be accurately fixed, and the natural sinking of the test piece under the gravity can be effectively prevented; and the operation is simple and convenient, and the reliability is high.

Description

technical field [0001] The invention belongs to the technical field of rock mass mechanical performance testing, and relates to a mold and a test block manufacturing method capable of accurately fixing joint shear test specimens. Background technique [0002] The shear strength of rock joint surfaces and their fillings is one of the key issues in the field of rock mechanics. Rock joint shear tests use alternative materials such as raw rock or concrete as specimens. Mortar pouring was carried out in advance to make two test blocks. After curing and forming, the joint surfaces of the upper and lower half joint test pieces were accurately occluded and then the shear test was carried out. During the occlusal process of the joint surfaces of the upper and lower half joint specimens, the position of the joint surfaces needs to be precisely positioned to ensure accurate and reliable test results. Usually a standard 150mm×150mm×300mm cuboid test block mold is used, and after visual...

AI Technical Summary

Problems solved by technology

For regular cube and cuboid shape specimens, this method is somewhat operable; however, for irregular shape specimens, this method is difficult to ensure the accurate occlusion of the joint surfaces of the two test pieces

In addition, during the mortar curing and forming process, the joint specimen will naturally sink under the action of gravity, and the depth of the specimen embedded in the mortar cannot be guaranteed, resulting in insufficient occlusion or misalignment of the joint surfaces, which is not conducive to obtaining reliable test results

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