Space-Time Distribution Laws of Tunnel Excavation Damaged Zones (EDZs) in Deep Mines and EDZ Prediction Modeling by Random Forest Regression

Figure 7

Relationship between V_p and L of different dates in Section 3: (a) test results on March 26, (b) test results on April 3, (c) test results on April 11, and (d) initial size and final size of the EDZ.

(a)

(b)

(c)

(d)