Experimental Study on the Evolution of Argillization of Mudstone and Cutter Wear during the TBM Tunnelling

Figure 3

Evolution of microstructures of cutting grooves of rock blocks at ×400 magnification. (a) 5 min, P/D = 0.04; (b) 10 min, P/D = 0.06; (c) 15 min, P/D = 0.07; (d) 20 min, P/D = 0.09; (e) 30 min, P/D = 0.13; (f) 40 min, P/D = 0.15; (g) 50 min, P/D = 0.17; (h) 60 min, P/D = 0.18.

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