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In order to analyze the strength variation characteristics of cemented backfill mass at different temperatures under dynamic loading, a SHPB impact test was performed to study the mechanical properties of cemented backfill mass under dynamic loading during the energy evolution process. The results show that the compressive strength of the cemented backfill mass under dynamic loading increases as the curing temperature rises, and presents obvious splitting tensile failure. It is also found that the stress-strain curves of backfill mass at different curing temperatures are similar, all consisting of three stages: quasi-elastic stage, plastic deformation stage and post-peak failure stage. The backfill mass experiences a wave impedance effect. At an approximate strain rate (100 s-1), about 77% of the energy is reflected and about 2% of the energy is transmitted through the backfill mass during the impact process. As the curing time is prolonged and the curing temperature rises, the energy absorption density and transmissive energy of the backfill mass increase. The micro-analysis shows that with the rise of curing temperature, the internal hydration reaction of backfill mass occurs at a higher rate, leading to higher degree of hydration and more hydration products. Those hydration products gradually fill in the internal pores of backfill mass, resulting in denser microstructure. It further confirms that increasing curing temperature can improve the early strength of backfill mass.
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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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