Method for making internal prefabricated cracks in rock samples
A technology for rock samples and prefabricated cracks, which is applied in the field of geotechnical engineering, can solve the problems of high cost, low strength, and difficult sample preparation of jointed rocks, and achieve the effects of reducing test costs, wide applicability, and simple operation
Active Publication Date: 2019-07-12
HOHAI UNIV
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Problems solved by technology
[0003] Due to the difficulty in sample preparation of jointed rocks, it is almost impossible to make regular rock samples in batches for laboratory test research
The current 3D printing technology is too expensive to produce an internally jointed sample, and can only be made into an isotropic low-strength sample
So far, there has not been a method that can produce internal joints or cracks that meet the rock mechanical properties at low cost, which also restricts the overall development of rock mechanical properties research
Method used
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Embodiment
[0029] The method provided by the invention is used to manufacture prefabricated cracks, which not only has low manufacturing cost and is convenient to manufacture, but also can be manufactured in batches. However, in the crack making project, the rock sample must be cut first, and then spliced with high-strength cement, so whether the cutting will affect the strength, brittleness and dilation characteristics of the rock sample, the following Describe in detail with specific examples. Cut the rock sample into two sections, then use the convenient high-strength cement provided by the present invention to splice the two sections, and compare the spliced rock sample with the rock sample before cutting:
[0030] figure 1 It is the strength comparison chart of rock samples before and after cutting. The abscissa is the confining pressure in MPa, and the ordinate is the axial pressure in MPa. It can be seen from the figure that the rock test before and after cutting The peak in...
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The invention provides a making method of an internal precrack of a rock specimen. The making method comprises the following steps of a step I, cutting the rock specimen; a step II, making of a crack: processing a precrack by using a machine tool or a water jet cutter, carrying out perforation on two end surfaces of a specimen unit, namely the cut surfaces of the rock specimen, so as to further form the crack; a step III, splicing the specimen units; a step IV, maintenance of a spliced specimen: after the splicing is completed, adopting normal-pressure evaporation maintenance, after the maintenance is finished, standing and air-drying the spliced specimen in a natural condition, and then removing high-strength cement protruding from the surface of the spliced specimen by using fine sandpaper or a wet duster. The method is low in manufacturing cost, is convenient in making, and can be used for carrying out batch making.
Description
technical field [0001] The invention relates to a method for making prefabricated cracks inside a rock sample, and belongs to the technical field of geotechnical engineering. Background technique [0002] There are many types of rocks with complex properties, and the experimental research on the mechanical properties of rocks started relatively late. There are a large number of primary cracks distributed inside the rock, and there are even many joints, and the complex medium often encountered in the rock mass engineering of the jointed rock has the characteristics of heterogeneity, anisotropy and discontinuity, and its strength , deformation, destruction and rheological characteristics will directly affect the design, construction and reinforcement scheme of rock mass engineering. [0003] Due to the difficulty in sample preparation of jointed rocks, it is almost impossible to make regular rock samples in batches for laboratory test research. The current 3D printing techno...
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IPC IPC(8): G01N1/28
CPCG01N1/28
Inventor 朱其志史海岭王伟张冬梅李鹏飞张坤吴祝林余乔娟
Owner HOHAI UNIV