Full
Outline
In-situ stress measurement is one of the indispensable basic work in deep resource mining engineering. Diametrical core deformation analysis (DCDA) method, which measures the diametrical deformation of the core samples, is not limited by the borehole depth. It offers advantages of convenient operation and reusability for obtaining in-situ stress information from deep boreholes. Based on the principle of DCDA method and high-precision laser ranging technology, a core orientation method using borehole images and core surface scanning was proposed, which realized the determination of the geographical orientation of the core samples, and determined the direction of the horizontal principal stress by the radial ellipse shape of the oriented core. This method was applied to the deep hole in-situ stress measurement of a phosphate mine in Guizhou, and verified by hydraulic fracturing method. The results show that the maximum horizontal principal stress direction determined by DCDA method is NE66° to NE81°, and the maximum horizontal principal stress direction determined by hydraulic fracturing method is NE64° to NE80°. The minimum deviation value determined by the two methods is 3°, and the maximum deviation value is 17°. At the same depth, the deviation of the maximum horizontal principal stress value determined by the DCDA method and the hydraulic fracturing method is within 5.0％, and the results measured by the two methods are basically the same. A new idea of in-situ stress measurement combining diametrical core deformation analysis method and differential strain curve analysis method (DSCA method) was proposed. The two methods complement each other in data utilization and can calculate the three-dimensional stress value of underground rock mass.
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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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