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在黔西丫他矿区坑道施工中，以往一直沿用普通爆破法，梯形断面与木材支护。由于爆破与支护方法存在许多难以克服的缺点，使围岩松动、地压增大，在掘进施工中多次发生两帮岩层滑移和顶板冒落事故。如CD123主坑因一帮岩层滑移砸坏凿岩台车，造成凿岩工两名重伤、一名轻伤的重大事故。CD325坑口一号穿脉交岔口附近的最大一次冒顶，长20米，宽6米，高10多米，经过一个月的抢修才使坑口恢复生产，支出木料和人工费达6000多元。岩层滑移和顶板冒落事故的发生，打乱了生产计划，增加了费用，更重要的是人身安全得不到保证。此外，支护消耗的木材数量很大（每年300～400米~3），在供应上难以得到充分保证。
In Hexi Qianya mining tunnel construction, in the past has been used in general blasting method, trapezoidal section and timber support. Because blasting and supporting methods have many insurmountable shortcomings, the surrounding rock looses and the ground pressure increases. Two accidents of rock slide and roof caving occur in the tunneling construction. Such as CD123 main pit due to a gang of rock slide smashed drilling rig, resulting in two serious rock drill, a minor injury a major accident. One of the largest fallout near the crossing of CD325 Hang Hau was a length of 20 meters, a width of 6 meters and a height of 10 meters. After one month of repairs, the pithead was resumed production and the expenses for wood and labor expenses amounted to over 6,000 yuan. The occurrence of rock slide and roof caving accident disrupts the production plan and increases the cost. More importantly, personal safety can not be guaranteed. In addition, the amount of wood consumed by support is very high (300-400 m 3 per year) and it is difficult to be adequately assured of supply.