Full
Outline
The temperature field of deep tunnels and the development of deep mineral resources involve the thermal conductivity of rock mass. For the nonlinear change rule of effective thermal conductivity of fractured rock mass under normal stress, based on the two-part Hooke's model and effective thermal conductivity series-parallel theory, a theoretical model of effective thermal conductivity of fractured rock mass under normal stress was established, and the influences of model parameters on the effective thermal conductivity of fractured rock mass under stress were analyzed. Through the numerical simulation results of the change of temperature field in Nigel Tunnel, the reliability in engineering application of the model was verified. The results show that, the theoretical model prediction results are in good agreement with the test data. The effective thermal conductivity of the fractured rock mass in the low stress stage is mainly affected by the soft part of the pore-slit closure, and increases nonlinearly with the increase of the stress. While the effective thermal conductivity of the fractured rock mass in the high stress stage is mainly affected by the hard part of the pore-slit closure, and increases slowly in an approximately linear manner with the increase of the stress. The larger the angle between the fracture surface and the direction of heat transfer, the smaller the effective thermal conductivity of the rock at the same stress, and the higher the degree of non-linearity with the stress change. Comparing the numerical simulation results with the measured data, the thermal conductivity of the intact rock mass is on the large side, the effective thermal conductivity obtained by the stress-independent effective thermal conductivity model is on the small side, and the coupling model of normal stress and thermal conductivity is more in line with the actual measured values.
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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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