Research Article
A Computing Method for Sand Inrush Quantity through a Borehole in Longde Coal Mine
Table 6
Max roughness of technical standard in part country.
| Country | Max roughness of technical standard (mm) | Technical standard |
| China | 0.4 | GB1031-83 | USA | 0.1 | BS1134-61/ASAB46.1-62 | Switzerland | 0.2 | VSM10321-62 | Italy | 0.1 | UNI13963-60 | Japan | 0.4 | JISB0601-70 | Poland | 0. 32 | PN58/M042-51 |
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