Abstract The construction of a viaduct over-passing an existing open cut railway tunnel has the characteristic of adjacent construction, which may cause stress redistribution of the surrounding rock. The load caused by T-beam construction especially affects the safety of the project due to the distribution of internal lining axial force and bending moment. This paper analyzes and compares the effects of two methods-full framing construction and post-and-beam framing construction-using ANSYS software and construction analysis to assess the effects on the safety of adjacent construction under-passing an open cut tunnel; the viaduct of the highway which runs from Guiyang to Duyun over the existing open cut Baisuo tunnel is used as an example. It is concluded that the minimum safety factors of plain concrete for open cut tunnels using these two methods are 3.1 and 3.7 respectively. The full framing and strip foundation method is found to be most cost effective.
Abstract：
The construction of a viaduct over-passing an existing open cut railway tunnel has the characteristic of adjacent construction, which may cause stress redistribution of the surrounding rock. The load caused by T-beam construction especially affects the safety of the project due to the distribution of internal lining axial force and bending moment. This paper analyzes and compares the effects of two methods-full framing construction and post-and-beam framing construction-using ANSYS software and construction analysis to assess the effects on the safety of adjacent construction under-passing an open cut tunnel; the viaduct of the highway which runs from Guiyang to Duyun over the existing open cut Baisuo tunnel is used as an example. It is concluded that the minimum safety factors of plain concrete for open cut tunnels using these two methods are 3.1 and 3.7 respectively. The full framing and strip foundation method is found to be most cost effective.
HU Hui,
ZHANG Jun,
Zheng-Yu-Chao
.Study of Effects of Under-Pass Tunnel by Viaduct T-Beam with Two Construction Methods[J] MODERN TUNNELLING TECHNOLOGY, 2011,V48(5): 70-75
2011, Vol. 48 