Abstract Using the software Abaqus, the influence of spandrel cracks on the overall stability and strength of an arched tunnel with straight walls is analyzed and a failure law is established based on a model test. The Tresca criterion at various points along the tunnel periphery and the stress intensity factors YI and YII at the crack tips are calculated by numerical simulation and the simulated results are verified by a model test. The results indicate that: the overall stability and strength of an arched tunnel with straight walls could be reduced by cracks at the spandrel depending on the variation of the included angle θ between the crack and side wall; and when θ=130°, tunnel strength is minimized, the dimensionless stress intensity factor YII at the crack tip is maximized, and the stress concentration is more significant.
Abstract：
Using the software Abaqus, the influence of spandrel cracks on the overall stability and strength of an arched tunnel with straight walls is analyzed and a failure law is established based on a model test. The Tresca criterion at various points along the tunnel periphery and the stress intensity factors YI and YII at the crack tips are calculated by numerical simulation and the simulated results are verified by a model test. The results indicate that: the overall stability and strength of an arched tunnel with straight walls could be reduced by cracks at the spandrel depending on the variation of the included angle θ between the crack and side wall; and when θ=130°, tunnel strength is minimized, the dimensionless stress intensity factor YII at the crack tip is maximized, and the stress concentration is more significant.
LI Yuan-Xin,
Zhu-Zhe-Ming
.Numerical Analysis and Experimental Study of the Influence of Spandrel Cracks on Tunnel Stability[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(5): 114-120
2014, Vol. 51 