Abstract Based on the finite-element strength reduction technique, the effects of principal stress orientation on tunnel stability were studied by experimental and numerical methods. In the numerical simulation, ABAQUS code was adopted to calculate the safety factor and the equivalent plastic strain on the integral point of the arched tunnel with a vertical wall under different orientations of principal stresses, and the results agree well with the experimental results. The study results show that the finite-element strength reduction method can be well applied to the analysis of tunnel stability; the orientations of principal stresses affect tunnel stability significantly; if only the factor of principal stress orientation is considered, when the angle between the major principal stress and tunnel vertical axis is 45°, the tunnel model′s compressive strength is the lowest, the safety factor is the smallest, and the corresponding tunnel stability is the worst.
Abstract：
Based on the finite-element strength reduction technique, the effects of principal stress orientation on tunnel stability were studied by experimental and numerical methods. In the numerical simulation, ABAQUS code was adopted to calculate the safety factor and the equivalent plastic strain on the integral point of the arched tunnel with a vertical wall under different orientations of principal stresses, and the results agree well with the experimental results. The study results show that the finite-element strength reduction method can be well applied to the analysis of tunnel stability; the orientations of principal stresses affect tunnel stability significantly; if only the factor of principal stress orientation is considered, when the angle between the major principal stress and tunnel vertical axis is 45°, the tunnel model′s compressive strength is the lowest, the safety factor is the smallest, and the corresponding tunnel stability is the worst.
.Influence of Principal Stress Orientation on Tunnel Stability Based on the Finite-Element Strength Reduction Method[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(2): 61-67
2017, Vol. 54 