Study on the Fracture Behavior of Cracks Emanating from Tunnel Spandrel under Blasting Loads by Using TMCSC Specimens

Figure 8

The voltage signal recorded by CPG and the propagation speed of the cracks. Voltage signal curve of specimen with inclination angle (a) −45° and (b) 45°. Relation between (c) crack speed and crack length and (d) average crack speed versus crack length.

(a)

(b)

(c)

(d)