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Analysis of Lateral Slope Stability During Construction of a Loess Tunnel
with a Large Section
(1 School of Civil Engineering ,Lanzhou University of Technology, Lanzhou Gansu 730050; 2 Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou Gansu 730050;3 Northwest Center for Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou Gansu 730050)
Abstract For a loess tunnel with a large section passing through a lateral slope, some engineering risks like landslide or collapse are easily induced by tunneling construction, which frequently disturbs the soil mass. Based on a test section of a specific project, the lateral slope was reinforced before tunnel construction. With stability calculation for the lateral slope and using the improved strength reduction method, as well as reductions to the tensile strength index and shear strength index, the impacts of the three tunneling methods of short bench, CD, and CRD on lateralslope stability were simulated and analyzed using the FLAC3D numerical model. Engineering practice shows that the analytical results by improved strength reduction method generally agree with the actual ones under the condition of the undefined potential sliding surface of the lateral side slope, the effects on stabilityof the lateral slope is evident under continuous excavation, and the CRD method is most suitable for the construction of a unsymmetrical loading loess tunnel with a large section once the lateral side slope is reinforced.
Abstract：
For a loess tunnel with a large section passing through a lateral slope, some engineering risks like landslide or collapse are easily induced by tunneling construction, which frequently disturbs the soil mass. Based on a test section of a specific project, the lateral slope was reinforced before tunnel construction. With stability calculation for the lateral slope and using the improved strength reduction method, as well as reductions to the tensile strength index and shear strength index, the impacts of the three tunneling methods of short bench, CD, and CRD on lateralslope stability were simulated and analyzed using the FLAC3D numerical model. Engineering practice shows that the analytical results by improved strength reduction method generally agree with the actual ones under the condition of the undefined potential sliding surface of the lateral side slope, the effects on stabilityof the lateral slope is evident under continuous excavation, and the CRD method is most suitable for the construction of a unsymmetrical loading loess tunnel with a large section once the lateral side slope is reinforced.
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published: 2013-12-04
Cite this article:
CHEN Si-Yang-1,
2 ,
ZHU Yan-Peng-1 etc
.Analysis of Lateral Slope Stability During Construction of a Loess Tunnel
with a Large Section
[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(1): 82-89
2014, Vol. 51 