Full
Outline
After grouting reinforcement of fractured rock masses, both filled and unfilled fractures often coexist internally. To investigate the shear characteristics of rock masses under fracture differential filling, a numerical model of grouting-bonded particle flow was constructed based on the indoor direct shear tests of intact and fractured grouting-bonded red sandstone, and the meso-mechanical parameters of grouting rock mass were obtained. The numerical simulation of normal stress direct shear was carried out for red sandstone samples with prefabricated 45° parallel double fractures under unfilled, half-filled (left-filled, right-filled) and full-filled conditions. The results show that under the half-filled condition, the tensile-shear fractures are first generated at both ends of the open fractures, and gradually expand to both ends of the rock until failure. After failure, the proportion of tensile-shear, compression-shear and tensile fractures remains basically unchanged, among which the tensile-shear fractures account for the largest proportion, about 80%. Compared with the left-filled condition, the right-filled condition enters the failure stage faster, but the number of fractures is less than that of the left-filled condition. Filling fractures with epoxy resin slurry can weaken the guiding effect of open fractures on fracture initiation when rock mass is damaged, and improve shear strength. The shear strength under left-filled and right-filled conditions is not much different, and the shear strength increases best under full-filled conditions. The research results have reference significance for the evaluation of grouting effect in fractured rock mass.s.
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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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