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Research Article

Control of Rock Block Fragmentation Based on the Optimization of Shaft Blasting Parameters

Table 3

Geological conditions of the shaft in Jinhua mountain tunnel.

ElevationGeological conditionsSurrounding rock classification

476.0-467.5It is a silty clay with gravel, which is loose with block stones distributed locally.V
467.5-456.0It is tuff of Huangjian formation or crystal chip fusion, the rock is strongly weathered and locally contains breccia, rock joints and cracks are developed, and the rock quality is hard.IV
456.0-222.5It is tuff and crystal debris fusion tuff, which are moderately weathered. The joints and crack are generally developed, thereby showing the block structure mosaic fragmentation. It belongs to hard rock with good integrity. It is locally mixed with tuff silty sandstone, and the rock quality is relatively hard.III

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