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Outline
In order to investigate the mechanical properties and permeability evolution of limestone with parallel double fissures during complete stress-strain processes before and after grouting, the complete stress-strain seepage tests was carried out on limestone with 45° parallel double fissures before and after grouting under the confining pressure of 10 MPa, 20 MPa and 30 MPa. The test results show that the strength of limestone with parallel double fissures before and after grouting increases nonlinearly with the increase of confining pressure, but the permeability decreases with the increase of confining pressure. Under the same confining pressure conditions, the strength of the specimens after grouting is significantly improved compared with that before grouting. Before grouting, the permeability of parallel double fissures specimens showed a "double peak" phenomenon. After grouting, the grout filled the cracks of the specimens, enhanced the bonding force between the fissure surfaces, changed the geometric shape and mechanical properties of the fissures, thus reducing the occurrence of "double peak" phenomenon. Compared with the specimens before grouting, the pre-peak permeability of the specimens after grouting decreased slightly, but the post-peak permeability decreased significantly. The five key permeability values of the two types of specimens gradually decrease with the increase of confining pressure. Under the same confining pressure, the key permeability values of the specimens after grouting are significantly lower than those of the ungrouted specimens.
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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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