ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2017, Vol. 37 ›› Issue (S2): 169-174.DOI: 10.3973/j.issn.2096-4498.2017.S2.025
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WAN Junfeng1, LI Dongsheng2
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Abstract:
Extremely complex terrains, i.e. rock bulge of tunnel roof, high and vertical rockface under tunnel roof, and asymmetricallypressured steep and high terrain on tunnel roof, are encountered during construction of Pingqiao #1 Tunnel portal on Menghua Railway; the Yingpanshan Bridge is connected to the tunnel portal; a series of problems, i.e. interaction between bridge abutment and tunnel portal structure, slope protection and tunnel portal breakthrough and layout of construction fields, exist in design. Hence, the terrain of construction site and geological conditions are investigated; comparing analyses are made for advantages and disadvantages of both integral mode and separation mode of bridgetunnel connection; the integral bridgetunnel connection mode is adopted; a design scheme for asymmetrical structure is proposed for asymmetricallypressured steep and high terrain to protect the slope; the problems of tunnel portal breakthrough and layout of construction fields have been solved by connecting constructed bridge with temporary bailey beam bridge.
Key words: bridgetunnel connection section, tunnel portal, integral mode, separation mode, slope protection, sandstone
CLC Number:
U 455
WAN Junfeng, LI Dongsheng. Study on Structural Design of Tunnel Portal at BridgeTunnel Connection Section Under Complex Terrain Conditions[J]. Tunnel Construction, 2017, 37(S2): 169-174.
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http://www.suidaojs.com/EN/Y2017/V37/IS2/169