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Outline
To investigate the damage effect of fractured rock masses in deep geothermal high-temperature environment, gneiss was taken as the research object, and micro CT scanning was carried out to obtain the micro-fracture evolution characteristics of rocks under geothermal high-temperature action. Combined with three-dimensional seepage simulation and uniaxial compression test, the permeability performance and strength degradation law were analyzed. The results indicate that geothermal high-temperature effects can cause structural damage to rock masses. As the heat treatment temperature increases from 25 ℃ (untreated) to 800 ℃, the quality loss rate of gneiss specimens rises from 0.181％ to 1.767％, the strength decay rate reaches 34.81％, and the surface porosity increases from 1.74％ to 6.28％. As the heat treatment temperature increases, the porosity of gneiss specimens gradually rises, and the non-uniformity of pore distribution intensifies. The non-connected pores within the rock continuously expand and interconnect, while the volume proportion of connected fractures significantly increases. The formation, propagation, and interconnection of thermal fracture surfaces caused by thermal damage effects adversely impact the impermeability and load-bearing performance of gneiss specimens. Given the multi-scale damage effect caused by geothermal high-temperature environment on deep rock masses, effective fracture sealing measures must be implemented in practical engineering to ensure the safe operation of deep mining.
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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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