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Outline
In order to study the influence of different inclination angles of prefabricated cracks on the mechanical properties and acoustic emission characteristics of rock and the crack expansion mechanism and rupture mode in the process of rock rupture, the Brazilian disc test was carried out by prefabricating disc specimens with different inclination cracks. The acoustic emission technique and the extended finite element method were used to observe and analyze the rupture evolution law of rock under different inclination cracks. The results show that with the increase of inclination angle, the crack initiation position shifts from the tip of prefabricated crack to the middle, and the parameters such as rock initiation load and peak load decrease first and then increase. The analysis results of acoustic emission parameters show that the specimens show various failure modes: the specimens with medium inclination angle mainly occur shear-tensile failure, while the specimens with higher or lower inclination angle mainly occur tensile splitting failure. The cumulative ringing count, cumulative amplitude, cumulative energy and bearing capacity of acoustic emission are consistent with the change trend of prefabricated crack inclination angles. The numerical simulation results are consistent with the laboratory test results, which confirms the effectiveness of the numerical simulation method in predicting rock crack expansion. The research results are helpful to predict and control the rupture behavior of rock mass in mining, tunnel excavation and other fields in engineering operations, and provide an effective reference for solving engineering safety problems in the industry.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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