Full
Outline
Accurate measurement of the uniaxial compressive strength of rock is the foundation of support design and rock mass stability analysis. By conducting indoor drilling tests on rocks with different strengths, the energy conversion and dissipation during the drilling process were analyzed, and the relationship between various forms of energy and rock strength in the process was studied. The results show that among the mechanical energy input by the drill bit, the torque work accounts for more than 95%, while the drilling pressure work accounts for no more than 5%. The energy input by the drill bit is mainly converted into the surface energy of drill cuttings, with an average conversion rate of 95.6%, and the average conversion rate of thermal energy is 4.2%. There is an obvious linear relationship between the net specific drilling work and the uniaxial compressive strength of mortar specimens with different strengths. The relational equation between the net specific drilling work and strength is obtained by fitting. This equation has been verified by using the drilling test results of concrete, sandstone and granite, with a maximum discrepancy rate of 5.07%. Relational equations between the surface energy of drill cuttings, thermal energy, acoustic energy and rock strength were obtained by fitting, and the relationships between various forms of energy and rock strength can be verified with each other. The drilling measurement method for rock strength based on drilling energy has good applicability.
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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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