Full
Outline
The distribution law of in-situ stress at working faces is crucial for the safe production of metal mines. Aiming at the complex problem of in-situ stress distribution at working faces under fault structure conditions in a spodumene ore body, the stress distribution law was explored by combining numerical simulation and field measurement. Based on measured data, the initial state of underground engineering under the real in-situ stress field was simulated using the rapid stress boundary method. The results show that stress concentration exists at the upper part of the hanging wall and the lower part of the footwall of each fault, and stress distribution at other positions presents obvious hierarchical characteristics. The inversion data of numerical simulation show that abrupt changes occur in stress contours on both sides of the faults. Specifically, the stress rises from 7 MPa to 20 MPa in areas with high fault density. The measured stress values are consistent with numerical simulation results in fault-free zones. It indicates that the rapid stress boundary method can accurately reflect the actual stress state of underground rock mass and help compensate for the limitation that measuring points must avoid adverse structural planes such as faults.
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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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