The theory of protective level blasting by using duplicate cushion in large hole is put forward and the optimized design of the duplicate cushion was done by numerical value calculation.

文章提出了在保护层爆破中采用大孔径复合垫层爆破，对复合垫层爆破的理论进行了研究，并通过数值计算对复合垫层进行了优化设计。

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The effective measures to control the vibration and fly rocks were adopted to successfully perform the application of large hole in shallow hole controlled blasting.

采用有效措施，对震动和飞石进行了控制，成功地完成了大孔在浅孔控制爆破中的应。

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The results show that the blast hole diameter has little effect of the vibration level in production blasting, and the other factors should be considered in large scale delay blast design.

结果表明，除炮孔孔径在实际生产爆破中对振动影响不明显外，其它因素在大区微差爆破的设计中都值得注意。

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