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In order to test the micro-vibration control ability of the mass concrete slab in the Beijing High Energy Photo Source, evaluation of the micro-vibration control ability of the mass concrete slab are conducted through two short-period tests and a 24 h long-period monitoring. Test results indicate that: most of the displacement root mean square values distribute between 10 nm and 50 nm in the two short-period tests, and most of the displacement root mean square values distribute below 20 nm in the 24 h long-period monitoring. The mass concrete slab can provide good micro vibration control performance over 10 Hz for the micro vibration in the vertical direction, and over 5 Hz for the micro vibration in the horizontal directions. Through casting the mass concrete slab, the micro vibration level in the vertical direction can be reduced by 24%, the micro vibration level in the horizontal direction can be reduced by 34%. The control ability of the slab to the horizontal micro-vibration is slightly better than that of vertical micro-vibration. Moreover, simplified two-dimensional finite element models are established to discuss the influence of changing the concrete layer’s density, stiffness and thickness on the slab’s micro-vibration control ability. The simulation results indicate that the increasing thickness of reinforced concrete layer or density of the plain concrete layer has no influence on the micro-vibration control ability of slab in the vertical direction, but has adverse effect on that in the horizontal direction.
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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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