鄂西队的竖井和浅井，复土掩差较深，一般在8—12公尺，泥土中夹有约三分之一的砾石，其粒度在100—800公厘，与粘土胶结甚紧，用十字镐挖掘效率低，在9公尺以内浅井，队班效率只达0.5公尺；有朱成生小组肯钻研想办法，提出土中放炮，通过试验证明，提高掘进效率到292％，而且大大地减轻了劳动强度。 Western team shaft and shallow well, complex soil deeper, usually 8-12 meters, with about one-third of the sand in the gravel, the particle size of 100-800 mm, and clay binding very tight, Digging with a pickaxe inefficient, less than 9 meters in shallow wells, team efficiency of only 0.5 meters; Zhu Chengsheng group willing to think of ways to put forward the soil blasting, proved by experiments to improve tunneling efficiency to 292%, and greatly Reduce the labor intensity.