Full
Outline
To effectively ensure the long-term stability of the extension section of the auxiliary inclined shaft in a mine of northern Shaanxi, ABAQUS software was used to analyze the influence of parameters such as thread spacing, anchorage length and borehole diameter on the bearing performance of the bolt, and reasonable anchorage parameters were selected. FLAC3D software was used to simulate the bolt support schemes of three kinds of spacing, and the optimal bolt spacing was determined by the displacement and plastic zone distribution. On this basis, field tests and surrounding rock deformation monitoring were carried out. The results show that the maximum tensile force of the bolt under 10 mm thread spacing is only 7.9 kN different from that under 8 mm thread spacing. Considering the production cost, the thread spacing of the bolt is determined to be 10 mm. The maximum anchorage force of the bolt increases with the increase of the anchorage length and the borehole diameter. After exceeding the critical value, the anchorage length and the borehole diameter have little effect on the anchorage force. Finally, the reasonable anchorage length is 800 mm and the borehole diameter is 28 mm. The control effect of surrounding rock with bolt support spacing of 1 200 mm and 1 000 mm is not much different. In order to improve the construction efficiency, the bolt spacing is determined to be 1 200 mm. The field practice shows that after using the optimized anchorage and support parameters, the average anchorage force of the bolt is greater than 150 kN, and the surface deformation of the surrounding rock is less than 25 mm, which can ensure the stability of the roadway and verify the rationality of the anchorage and support parameters.
50
23
| 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
