Influencing Factor Analysis on the Anomalously Low-Friction Effect in the Block Rock Mass

Figure 16

Time history curve of the normal force on the contact surface under different lithology. (a) Single lithology: all blocks are sandstone. (b) Combination 1: mudstone + sandstone + sandstone. (c) Combination 2: sandstone + coal + sandstone. (d) Combination 3: sandstone + sandstone + mudstone.

(a)

(b)

(c)

(d)