Manufacturing method for rock test sample containing hole defects

Abstract

The invention belongs to the field of geotechnical engineering and particularly relates to a manufacturing method for a rock test sample containing hole defects. The manufacturing method for the rock test sample containing the hole defects comprises the following steps: (1) preparing a tin ball for simulating the hole defects; (2) preparing a mortar material for simulating a rock material; (3) mixing and agitating the tin ball and the mortar material; (4) filling a molding mould with a mixture, and vibrating and molding; (5) detaching the molding mould; (6) curing the test sample under the conditions of constant temperature and constant humidity; and (7) molding the rock test sample containing the hole defects at a low temperature. According to the manufacturing method for the rock test sample containing the hole defects, the manufacturing of a plurality of the hole defects in an engineering rock body is guaranteed and the probability density distribution of the hole defects can be conveniently adjusted so as to meet the conditions of the actual engineering rock body; the operation method is simple, efficiency and rapid and the application range is wide.

Description

technical field [0001] The invention relates to a method for making a rock sample containing hole defects. Background technique [0002] The 21st century is the century of underground engineering. Underground hydropower stations, petroleum engineering, large-scale mine roadways, underground railways, and river-crossing tunnels are all being built on a large scale at home and abroad, and the focus of rock mechanics research is increasingly shifting to the underground. In the construction of underground engineering, rock mass with holes and defects is a common complex rock mass in various rock mass engineering. The seepage characteristics of porous media greatly affect the oil recovery rate of petroleum engineering, and have great impact on hydraulic engineering, etc. Seepage stability of rock mass plays a vital role. The randomness of rock mass hole distribution, the diversity of shapes, the unevenness of distribution and the complexity of spatial combination make the projec...

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Problems solved by technology

[0005] 1. The article "Crack Propagation and Failure Behavior of Single Crack Defect Specimens at Different Angles" introduces a method for making single crack defect specimens (see "Journal of Rock Mechanics and Engineering" 2005, Issue 2, author: Lin Peng, etc.), this method uses ultrasonic drilling to process preset cracks, and then fills them with granite powder of the same material and an appropriate amount of cyanoacrylate adhesive. This method cuts from the surface of the rock sample to the inside, and cannot make the built-in hole defects of the rock;

[0006] 2. The article "Research on the Fracture Mode of Open Surface Cracks in Gabbros" introduces a method for making open surface cracks in gabbros (see "Journal of Rock Mechanics and Engineering", Issue 3, 2007, author : Guo Yanshuang, etc.), this method uses a circular cutting tool to prefabricate open surface cracks on the surface of the sample, this method is suitable for making surface cracks, and cannot cut and make built-in hole defects inside the rock;

[0007] 3. The article "Experimental Research on the Expansion and Penetration Process of Three-Dimensional Fracture Groups" introduced a method of simulating primary fractures by using elliptical thin aluminum sheets (see "Journal of Rock Mechanics and Engineering" 2008, issue 1, author Guo Yanshuang, etc.) , the aluminum sheet has a certain stiffness, which will affect the overall mechanical properties of the sample, and cannot effectively simulate hole defects;

[0008] 4. The article "Effect of Dip Angle of Three-Dimensional Built-in Cracks on Tensile Mechanical Properties and Fracture Characteristics of Rock-like Materials" introduces the method of prefabricating three-dimensional built-in cracks in rock-like samples (see "Journal of Rock Mechanics and Engineering", No. 2, 2009 , author: Li Shucai, etc.), this method uses a polyester film sheet to make three-dimensional built-in cracks, and the polyester film sheet has a certain hardness, which cannot effectively simulate multi-hole defects;

[0009] 5. The article "Uniaxial Compression Experimental Study on Deformation and Failure Characteristics of Brittle Marble with Intermittent Prefabricated Fractures" introduces a method of making intermittently fractured rocks in marble (see "Journal of Rock Mechanics and Engineering" 2009 No. 12 , author: Yang Shengqi, etc.), this method uses a high-speed electric cutting machine to cut rock samples and fills weak gypsum materials in the cracks. This method cuts from the surface of the rock sample to the inside, and cannot cut and make built-in hole defects inside the rock.

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