Bigger uncoupling is adopted to realize loose controlled blasting in the excavation of chasm notch blasting.
在公路路堑切槽开挖硐室控制大爆破中，采用较大不耦合比较进行松动控制爆破。
2
Subgrade excavation of rock using pneumatic drill and DTH drill Hole drilling, loose blasting in small and deep hole blasting, excavators and loaders loading ballast, dump truck, bulldozer tie.