Prefabricated crack preparation device and method for standard rock test piece

Abstract

The invention relates to a prefabricated crack preparation device and method for a standard rock test piece. The preparation device mainly comprises a cutting system, a driving system and a tabletop system. The standard rock test piece is arranged in the test piece cutter of the tabletop system and the test piece cutter comprises a crack positioning semi-open steel mold and a cutting angle adjuster. The cutting system is used for crack cutting of rock pieces. The driving system provides driving force for the cutting system. The cutting system and the driving system are arranged on the tabletopsystem. According to the prefabricated crack preparation device and method for standard rock test piece, the preparation of the inclined crack and the through crack of the standard rock test piece surface can be realized, the geometrical dimension and the cutting speed of the crack can be adjusted, the structure is simple, the manufacturing process is simple, the degree of mechanization is high,and the crack is prepared accurately, and can be widely applied to joint fracture rock mechanics tests in the field of hydroelectric, transportation, energy and mine engineering.

Description

technical field [0001] The invention relates to a device and method for making cracks in rock test pieces, in particular to a device and method for making prefabricated cracks in standard rock test pieces in mechanical tests. Background technique [0002] With the rapid development of society and the continuous increase of people's needs, the construction of underground projects in various fields such as energy, transportation, water conservancy, and national defense continues to go deep, and the deep rock mass structure is complex. Many types of defects such as cracks, fissures, joints, and beddings are formed inside the rock due to structural and atmospheric weathering, which directly affect the physical and mechanical properties of the rock, and bring great difficulty and uncertainty to the stability control of underground engineering. Certainty. Grasping the change law of the mechanical properties of fractured rock mass has very important guiding significance for the st...

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Problems solved by technology

[0004] "Journal of Rock Mechanics and Engineering" No. 9, 2017 introduced a method to prepare double fractures in sandstone, but this method cannot be used to prepare fractures in standard specimens and cannot prepare through fractures

[0005] "Journal of Geotechnical Engineering" No. 12, 2014 introduced a single-crack standard specimen preparation method, using a mixture of water, gypsum and cement to prepare the specimen, and inserting stainless steel sheets into the unsolidified material mixture to form open cracks , but this method cannot prepare the standard fracture specimen of the original rock, and cannot obtain the real mechanical parameters of the original rock

[0006] "Journal of Rock Mechanics and Engineering" No. 6, 2008 introduced a method for making a three-dimensional fracture group. The mica sheet is fixed in the mold as a prefabricated fracture, and the specimen is made by pouring a new type of unsaturated polyester resin material, but the specimen is not the original one. rock, which is quite different from the actual rock mass, and the real mechanical parameters cannot be obtained

[0007] "Journal of Rock Mechanics and Engineering" No. 3, 2007 introduced a method for making open surface cracks in gabbro, using a circular cutting tool with a diameter of 20mm to cut open surface cracks on the surface of the sample, but Fissure geometry is limited and cannot cut through fissures

[0008] The invention patent with the application number 201510814787.X introduces a method for making three-dimensional jointed and fractured cylindrical rock samples. High-pressure water jets are used to cut jointed and fractured cuboid-shaped regular rock blocks, but this method cannot be used for cylindrical standard rock samples. Parts for the preparation of cracks of arbitrary shape

[0009] The invention patent with the application number of 201720749290.9 introduces a device for making cracks on the surface of standard rock specimens. This device cannot realize the production of through-cracks, and has great restrictions on the size of cracks.

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