Instability Process of Crack Propagation and Tunnel Failure Affected by Cross-Sectional Geometry of an Underground Tunnel

<div>The main equipment used in the test system to monitor crack propagation and tunnel failure. (a) Key equipment. (b) Loading system. (c) The bearing system.</div>

Advances in Civil Engineering

fig1

Figure 1

Figure 1: Instability Process of Crack Propagation and Tunnel Failure Affected by Cross-Sectional Geometry of an Underground Tunnel 