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MODERN TUNNELLING TECHNOLOGY 2018, Vol. 55 Issue (2) :103-109    DOI:
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Study of the Invert Installation Issues for a Three-Lane Road Tunnel in Surrounding Rock of Grade Ⅲ1
(1 School of Civil Engineering, Hebei University of Engineering, Handan 056038; 2 School of Civil and Transportation Engineering,Hebei University of Technology 300401)
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Abstract For a three-lane road tunnel in surrounding rock of grade Ⅲ, the concrete invert with the thickness of 45 cm should be installed according to the requirements specified in the Code for Design of Road Tunnels. However,as per the Guidelines for Design of Highway Tunnels the invert can be eliminated. Based on Shengjie expressway tunnel project, flat and inverted arch structures in grade Ⅲ1 surrounding rock are simulated and compared using finite-difference software. The results show that the differences between the vertical displacement, vertical stress and volume of the plastic zone of the two support structure patterns are within the scope of 5%; a flat arch structure can be used instead of an inverted arch for the three-lane tunnel in grade Ⅲ 1 surrounding rock, and the flat arch structure can meet the requirements of structure stability.
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Keywords： Road tunnel   Canceling of inverted arch   Stability analysis of surrounding rock support   Numerical simu? lation   Site monitoring     
Abstract： For a three-lane road tunnel in surrounding rock of grade Ⅲ, the concrete invert with the thickness of 45 cm should be installed according to the requirements specified in the Code for Design of Road Tunnels. However,as per the Guidelines for Design of Highway Tunnels the invert can be eliminated. Based on Shengjie expressway tunnel project, flat and inverted arch structures in grade Ⅲ1 surrounding rock are simulated and compared using finite-difference software. The results show that the differences between the vertical displacement, vertical stress and volume of the plastic zone of the two support structure patterns are within the scope of 5%; a flat arch structure can be used instead of an inverted arch for the three-lane tunnel in grade Ⅲ 1 surrounding rock, and the flat arch structure can meet the requirements of structure stability.
Keywords： Road tunnel,   Canceling of inverted arch,   Stability analysis of surrounding rock support,   Numerical simu? lation,   Site monitoring     
Cite this article:   
.Study of the Invert Installation Issues for a Three-Lane Road Tunnel in Surrounding Rock of Grade Ⅲ1[J]  MODERN TUNNELLING TECHNOLOGY, 2018,V55(2): 103-109
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