protecting pillar

• 保安矿柱

protecting pillar的用法和样例：

例句

1. As a result,the short hole shrinkage method with flat bottom structure was employed to mine the stope firstly,then stoping ore pillar by medium length hole caving method.
   后沟金矿采用平底结构浅孔留矿法先采矿房，后用中深孔崩落法回采矿柱，经两年多的生产实践，取得较好的技术经济指标。
2. The results of numerical simulation showed that if the floor pillar is mined partially, the stress in pillars will sharply increase, so integral stability of mine may weaken.
   模拟结果表明，部分底柱抽采后，起关键支撑作用的底板横撑和矿柱中的应力有显著地变化，这可能破坏矿山整体稳定性。