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Ⅲ1级围岩三车道公路隧道仰拱设置问题研究
（1河北工程大学土木工程学院，邯郸 056038；2河北工业大学土木工程学院，天津 300401）
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)
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.
.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
2018, Vol. 55 