Creep Mechanical Properties of Granite under Combined Axial Compression and Water Pressure and Support Characteristics of Surrounding Rock

Figure 13

Schematic diagram of different distances of prestressed bolt lag working face. (a) Prestressed bolt lags 10 m behind working face. (b) Prestressed bolt lags 20 m behind working face. (c) Prestressed bolt lags 40 m behind working face. (d) Prestressed bolt lags 80 m behind working face.

(a)

(b)

(c)

(d)