Recent Works

M. Ichinose
Kyushu University

When a mine tunnel is driven in weak strata under high stress conditions, an excessive tunnel closure occurs and impedes the passage of equipment, supplies, personnel, and ventilation air. The key to controlling the excessive closure is to control the floor heave that results from weak or soft floor rock.

In underground coal mines, mine tunnels or roadways are driven in coal measures strata. The coal measures rocks in Japan are sandstone, shale, sandyshale, mudstone, tuff, conglomerate, etc. Ground control problems in roadway drivage and maintenance are always closely connected with weak and soft rocks such as shale and mudstone. Shale and mudstone are prone to slaking in the presence of water because they contain clay minerals such as kaolinite and montmorillonite that have great water absorption properties. These minerals cause a slaking phenomenon when wet.

From this point of view, My recent discusses how slaking-prone shale can be reinforced by cement grouting by means of finite element modeling and laboratory tests.

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