Full
Outline
To investigate the influences of fissure dip angle and filling material on the rock mechanical properties, uniaxial compression tests were conducted on fissured sandstone specimens containing fractures with varying dip angles and filling materials. Digital Image Correlation (DIC) and Acoustic Emission (AE) techniques were employed to monitor the deformation and fracture processes. DIC was used to capture surface strain distribution and crack propagation morphology, and AE was utilized to monitor the crack evolution processes. The distribution characteristics of the RA-AF parameters were analyzed. The results indicate that the filling material prolongs the elastic deformation stage of the fissured sandstone and enhances its brittleness. The effect on the compressive strength diminishes as the inclination angle of the fissures increasing. The elastic modulus of the unfilled specimens is positively correlated with the dip angle of the fissures, while the elastic modulus of the filled specimens is not affected by the dip angle of the fissures. After filling, the strain distribution of the specimens is more uniform, and the crack propagation path becomes concentrated. The unfilled sandstone specimens with a fissure dip angle of 0° to 15° exhibit wing-shaped tensile failure, while those with angles of 30° to 90° show wing-shaped shear failure. All filled specimens exhibit mixed tensile-shear failure. The AE analysis results show that the crack propagation in the unfilled specimens is consistent with the DIC results, while in the filled specimens, tensile cracks are the main type and shear cracks are secondary. The filling materials significantly alter the mechanical behaviors of fissured sandstone. The failure mode and crack evolution are jointly controlled by the filling state and the dip angle of the fissures. The research results provide a theoretical basis for the stability analysis of engineering involving filled-fissured rock masses.
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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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