tunneling advance rate

• 掘进速度

tunneling advance rate的用法和样例：

例句

1. Along with the rapid development of coal industry, it is higher request to the laneway tunneling speed.
   随着煤炭工业的迅速发展，对巷道掘进速度的要求也越来越高。
2. Under gassy coal seam condition, the full-heading development is employed.Because of the fast heading a high rate of gas emission arises.
   在瓦斯含量较大的煤层采用综掘掘进巷道，由于掘进速度快，出现了瓦斯涌出量过大的现象。