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Outline
Underground rock masses often contain fissures with different inclination angles and various fillings, and the crack propagation and failure behavior of rock bridge structures directly affect the stability of underground rock engineering. Through uniaxial compression tests on filled jointed red sandstone with different inclination angles, acoustic emission parameters (ring count, rise time, amplitude, duration) monitoring and FRACOD numerical simulation, the crack propagation law and damage mechanism of rock bridge structures in filled joints under different inclination angles of joint were systematically studied. The results show that the stress-strain curves exhibit three stages of compaction, elastic deformation and rapid stress drop. A stress surge occurs near the peak stress due to specimen slip and crack initiation. The acoustic emission signals increase significantly before and after the peak stress. The cumulative ring count shows a stepwise jump, and the abrupt increase points of its curve can effectively determine the critical point of crack initiation. The results of RA-AF analysis show that the proportion of shear cracks is the largest when inclination angle of joint is 30°, and tensile failure dominates when inclination angle of joint is 45°. With the increase of inclination angle of joint, the crack propagation mode transforms from tensile-dominated to tensile-shear composite, and then back to tensile-dominated. The FRACOD simulation results show that with the decrease of stress ratio, the horizontal stress significantly restrains the initiation and propagation range of cracks. The increase in horizontal stress significantly changes the failure mode of the rock mass by inhibiting the propagation of tensile cracks. The results reveal the mechanism of joint inclination angle on crack propagation and damage evolution of rock bridge structures, providing a theoretical basis for stability analysis of deep underground rock engineering.
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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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