rock drift的例句大全

adopting the rhombus cut and the mid - deep - hole smooth blasting technology to realize fast heading in rock drift

采用直眼菱形掏糟中深孔爆破技术实现岩巷快速掘进

study on numerical value simulation technology of extremely soft rock drift

极软岩巷道的数值模拟技术研究

study on support technology of unconsolidated fragment soft rock drift

松散破碎膨胀型软岩巷道支护技术研究

to overcome the difficulty of unstability of orebody and surrounding rock, the test of flat-back cut-and-fill drift mining is carried out.

针对凡口铅锌矿狮岭顶板矿体和围岩极不稳固的牲，进行了机械化上向进路分层充填采矿工艺的试验研究。

practise on reverse construction in rock-drift of long distance and great angle

长距离大倾角岩巷反向施工实践

construction technology of center drift method for long span city underground engineering in shallow depth and weak surrounding rock

浅埋、大跨、软弱围岩城市地下工程中洞法施工工艺

study on the controlled perimeter blasting for drift in soft rock

软岩巷道周边控制爆破的研究

But this construction method need many excavations and dismantle of temporary drift heading supporting, it disturbs the surrounding rock heavily and increases construction period and temporary surrounding increases construction cost.

但该施工法需要进行多次的开挖和导坑临时支护的拆除，对围岩的扰动大，增加了施工工期，同时临时支护增加了工程造价。