Determination method for mesoscopic parameters simulating mechanical properties of intermittent crack rock

A meso-parameter and rock mechanics technology, applied in the direction of applying stable tension/pressure to test the strength of materials, can solve the problems of complex operation, high cost, long cycle, etc. Effect

Inactive Publication Date: 2014-07-23
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0003] Although the use of test methods, including model tests and physical tests, can obtain the process of crack initiation, propagation and penetration more intuitively, there are disadvantages such as complicated operation, high cost and long period.

Method used

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  • Determination method for mesoscopic parameters simulating mechanical properties of intermittent crack rock
  • Determination method for mesoscopic parameters simulating mechanical properties of intermittent crack rock
  • Determination method for mesoscopic parameters simulating mechanical properties of intermittent crack rock

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Embodiment 1

[0034] Embodiment 1: Taking the brittle sandstone from Linyi City, Shandong Province, China as an example, a method for determining the mesoscopic parameters for simulating the mechanical properties of intermittent fracture rocks is introduced, which includes the following steps:

[0035] a. First, sample the engineering rock mass to be tested, and make complete and intermittent three-crack cuboid samples from the sampled rock mass. The ratio of height to width of the complete and intermittently fractured cuboid samples is 2:1; the complete cuboid sandstone sample is shown in Figure 1(a), where the width L of the sample is about 80mm, and the height H is about 160mm, thickness W is about 30mm. Intermittent fracture parameters are shown in Fig. 4(b), where α=30°, β 1 =60°, β 2 =75°, 2a=15mm, 2b 1 =20mm, 2b 2 =20mm, the width of the three cracks is approximately 2.5mm;

[0036] b. Place the complete and intermittent three-crack cuboid sample in the three-axis airtight press...

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Abstract

Belonging to a rock mechanical determination method, the invention provides a determination method for mesoscopic parameters simulating mechanical properties of an intermittent crack rock. The method includes: firstly sampling an engineering rock mass to be tested, and making a complete and intermittent crack cuboid sample; placing the made sample in a sealed pressure cylinder of a servo test machine, firstly bringing a testing machine pressure head into close contact with the upper end and lower end of the rock sample; applying an axial pressure on the sample according to displacement loading, and conducting loading on the sample till fracture, thus obtaining a sample compression process stress-strain overall process curve, a crack propagation process and a final fracture mode; employing particle flow code in 2 dimensions (PFC2D) to establish a complete sample numerical model, and debugging the mesoscopic parameters continuously to acquire a set of mesoscopic parameters able to reflect complete rock sample test results; establishing an intermittent crack numerical model based on the mesoscopic parameters, carrying out compression process simulation, comparing the simulation results with the intermittent crack rock test results so as to further verify the accuracy of the mesoscopic parameters.

Description

Technical field: [0001] The invention relates to a method for measuring rock mechanics, in particular to a method for determining mesoscopic parameters for simulating the mechanical properties of intermittent fracture rocks. Background technique: [0002] In the field of rock mechanics, fractured rock is a complex medium often encountered in various rock engineering such as mining, water conservancy, petroleum, and nuclear waste storage. A large number of engineering practices have shown that the instability and failure of rock engineering is usually caused by the opening, initiation, expansion and penetration of internal cracks to generate new shear sliding surfaces. It is of great theoretical value and practical significance to study the influence of crack distribution on mechanical parameters such as rock strength and deformation, and crack initiation, propagation and penetration modes. [0003] Although the use of experimental methods, including model tests and physical...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
Inventor 杨圣奇黄彦华
Owner CHINA UNIV OF MINING & TECH
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