Manufacture method of rock sample with random fractures

Abstract

The invention belongs to the field of rock engineering, and specifically relates to a manufacture method of a rock sample with random fractures. The manufacture method comprises the following steps: (1) preparing a tin strip so as to simulate a crack; (2) preparing a mortar material so as to stimulate a rock material; (3) mixing and stirring the tin strip and the mortar material; (4) pouring the mixture into a forming mould so as to carry out a forming treatment through a vibrating and smashing method; (5) disassembling the forming mould; (6) maintaining the sample at a constant temperature under a constant humidity; (7) subjecting the random fracture rock sample to a low-temperature forming treatment. The manufacture method is capable of manufacturing a cracked rock with a large amount of random fractures, can conveniently modulate the probability density distribution of fractures so as to be accord with the actual situation of engineering rock, and has the advantages of simple operation, high efficiency, rapidness, and wide application range.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and in particular relates to a method for making a rock sample with random cracks. Background technique [0002] The 21st century is the century of underground engineering. Underground hydropower stations, large-scale mine roadways, underground railways, river crossing tunnels, underground oil storage caverns, etc. are all being built on a large scale at home and abroad, and the research focus of rock mechanics is increasingly shifting to underground. In the construction of underground engineering, randomly fractured rock mass is the most common complex rock mass in various rock mass engineering, and the stability of joints and fissures is of great importance to the safety of the rock mass structure of the entire underground engineering to a certain extent. important role. The randomness of the distribution of rock mass fissures, the diversity of shapes, the inhomogeneity of distribution ...

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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 built-in cracks in 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 cracks 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 multiple random cracks;

[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. The polyester film sheet has a certain hardness, so it is difficult to arrange cross spaces in space, and it is impossible to effectively simulate multiple cracks;

[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 cutter to cut rock samples and fills weak gypsum materials in the fractures. This method cuts from the surface of the rock sample to the inside, and cannot cut and make built-in fractures inside the rock.

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