Full
Outline
In order to study the stage mechanical response characteristics of dry and water-saturated siltstone during splitting process, Brazilian splitting test was carried out, and the stage division method of full stress-strain curve of rock splitting process based on splitting modulus was established. The response law and mechanical mechanism of stress characteristic value and strain characteristic value in each stage were systematically analyzed. The results show that water significantly affects the stress evolution path and strain development path of Brazilian splitting process in siltstone. The average values of compaction stress, yield stress, peak stress and unloading stress of water-saturated samples decrease to 62.65%, 50.21%, 48.93% and 68.11% of dry samples, respectively. The average value of stress ratio in compaction stage increases by 28.50%, and the average values of stress ratio in elastic stage, yield stage and failure stage decrease by 19.60%, 41.35% and 11.99%, respectively. The average values of compaction strain, yield strain, peak strain and unloading strain of water-saturated samples are 4.12%, 19.26%, 20.70% and 17.92% lower than those of dry samples, respectively. The average value of strain ratio in compaction stage increases by 20.38%. The average values of strain ratio in elastic stage and yield stage decrease by 29.64% and 36.93%, respectively, and the average value of strain ratio in failure stage increases by 347.73%. Saturated treatment enhances the plastic characteristics of splitting process. After saturated treatment, the bending energy index of siltstone decrease by 73.77%, and the impact tendency decrease from class Ⅲ to class Ⅱ. The research results can provide theoretical basis for water injection softening and anti-impact technology of deep mine roof.
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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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