Full
Outline
In high-altitude cold regions, complex physicochemical processes such as water-ice phase transitions, ice wedging, and filler dissolution/crystallization occur within rocks, which can easily lead to irreversible damage in rocks with filling fractures, seriously threatening the safety and stability of open-pit mine slopes and transportation infrastructure in these regions. Taking frozen sandstone with filling fractures (FSFF) as the research object, the acousto-optic combined testing technique was employed to investigate the effects of fracture length and fracture angle on the macroscopic mechanical properties, surface strain field, and acoustic emission (AE) parameters of the rock samples. The results show that as the fracture length increases, the compressive strength of the rock samples exhibits a continuously decreasing trend, and the crack propagation in the rock samples is dominated by S1 and S3 type shear cracks and M type tensile-shear mixed cracks. When the fracture length is short, the sharp increase in the AE ring count of the rock samples is concentrated in the crack propagation stage. As the fracture length increases, the phenomenon of the sharp increase in the ring count extends to the elastic stage and the crack propagation stage. With the increase in the fracture angle, the compressive strength of the rock samples first decreases and then increases. The number of sharp increase events in the AE ring count within the rock samples increases, and the spatial distribution of AE events becomes increasingly dispersed. The crack propagation in the rock samples is dominated by S1, S2, and S3 type shear cracks and M type tensile-shear mixed cracks. The failure mode of FSFF is primarily shear rupture. The lower the compressive strength of the rock sample, the greater the proportion of internal shear cracks. The research results can provide a theoretical basis for the engineering stability assessment of fractured rock masses in cold regions.
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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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