A Geomechanical Model Test on the Construction Stability and Overload Failure Process of an X-Type Cross Cavern Group

Figure 14

Photos of the caverns under the overloading of 1.7P: (a) from camera 1; (b) from camera 2; (c) from camera 3; (d) from camera 4.

(a)

(b)

(c)

(d)