Experimental device and method for testing three-dimensional fracture extension in high-precision rock sample loading
A technology for rock sample and crack expansion, applied in the field of rock, can solve problems such as the inhomogeneity of rock materials that cannot be well reflected, and achieve the effects of protecting service life, reducing contact surface, and positioning accurately
Pending Publication Date: 2021-07-30
HENAN POLYTECHNIC UNIV
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Problems solved by technology
Such as PPMM materials, transparent numerical materials, gypsum, etc. These model materials are very different from real rock materials, for example, they cannot well reflect the heterogeneity of rock materials, etc.
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[0027] The present invention will be further described below in conjunction with the accompanying drawings.
[0028] Such as Figure 1 to Figure 5 As shown, a kind of high-precision different rock sample loading process of the present invention three-dimensional fissure real-time expansion test experimental method, comprises rigid sensor converter 32, and sample 31 can be cylindrical rock sample or cuboid rock sample, and rock The samples can be divided into complete rock samples, prefabricated three-dimensional fracture impenetrable rock samples and prefabricated fracture penetrating rock samples. All prefabricated cracks can process single prefabricated cracks and multiple groups of prefabricated cracks, such as figure 1 shown. After preparing the sample, clean the surface with alcohol, and design sensors with different numbers of acoustic emission source signal localization according to the experimental needs. The sensor is connected to the sample through a sensor conver...
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The invention discloses an experimental device and method for testing three-dimensional fracture extension in high-precision rock sample loading. The experimental device comprises a rigid sensor converter, wherein one end of the sensor converter has a mounting surface matched with a sample, the other end of the sensor converter is provided with an acoustic emission sensor, the acoustic emission sensor is connected with a controller, and the controller is connected with a computer. Through the connection of the sensor converter and a rock sample, the contact surface of the sensor and the sample is reduced, the positioning is more accurate, the impact effect of sample damage on the sensor under the action of different loads, especially complex loads, is protected, and the service life of the sensor is protected. The low-frequency unequal-amplitude loading and unloading mode is necessary for researching and acquiring energy evolution data, and meanwhile, the loading mode prolongs the rock damage process, so that the acoustic emission source positioning can more stably and clearly observe the change condition in the catastrophe and degradation process of the internal structure of the rock.
Description
technical field [0001] The invention relates to an experimental test method for the real-time expansion of internal three-dimensional cracks during the loading process of a high-precision rock sample, belonging to the rock field. Background technique [0002] Under the action of load, the initiation, expansion, interaction and penetration of internal cracks in the rock mass are the reasons for the fracture and instability of the rock. Especially in the deep rock mass under the action of disturbance loads such as engineering excavation, exploring the law of microscopic initiation, local micro-crack expansion, nucleation and failure of rock mass spatial cracks has an important impact on engineering stability. Moreover, the law of progressive multi-scale crack growth in rocks and related data is an important basis for the study of crack growth mechanism, as well as an important basis for constitutive model creation and effective engineering safety warning. However, due to the ...
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IPC IPC(8): G01N3/32G01N3/08G01N3/06G01N1/08
CPCG01N3/32G01N3/08G01N3/06G01N1/08G01N2203/0003G01N2203/0005G01N2203/0019G01N2203/0066G01N2203/0658G01N2203/0252
Inventor 唐胡丹朱明礼朱珍德韩广强闫芙蓉田洋宸
Owner HENAN POLYTECHNIC UNIV