Full
Outline
The engineering disturbance in the process of mining often leads to a variety of fractures in the rock, which affects its mechanical properties. Using indoor uniaxial compression test, combined with XTDIC and acoustic emission monitoring system, the effects of fracture position, fracture dip angle and rock combination on the mechanical behavior and failure mode of layered composite rock samples with single fracture were investigated. The results show that with the increase of fracture dip angle, the peak stress of fracture rock samples gradually increases from 13.19-25.34 MPa to 33.89-42.99 MPa, the elastic modulus shows a non-monotonic change trend of increasing first and then decreasing, the deterioration coefficient gradually decreases from 0.32-0.66 to 0.06-0.20, and the strength deterioration effect of fracture on sandstone is more significant than that of limestone. The fracture position dominates the evolution of the failure mode. When the fracture is located in the upper part of the rock sample, the tensile failure is dominant. When the fracture is located in the middle of the rock sample, the failure mode is regulated by the fracture dip angle. Under the low fracture dip angle, the tensile failure is still dominant, and under the high fracture dip angle, it is transformed into tensile-shear mixed failure. The analysis of acoustic emission parameters (RA/AF value) shows that when the fracture dip angle is low, the priority cracks are mainly tensile cracks, accounting for 81.69%-88.41%. With the increase of fracture dip angle, the proportion of shear cracks increases, and the failure mode gradually transitions from tensile failure to multi-tensile and less-shear failure, and finally forms a tensile-shear mixed failure with tensile cracks accounting for 56.33%-62.73%.
35
10
| 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 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
