ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2015, Vol. 35 ›› Issue (12): 1271-1274.DOI: 10.3973/j.issn.1672-741X.2015.12.006
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LI Haijun1, WANG Mingnian2, ZHANG Wanbin1
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Abstract:
Several construction schemes are studied for a doublearch tunnel with concealed central wall by means of numerical simulation, so as to select reasonable construction scheme. Conclusions drawn are as follows: The tunnel structure with concealed central wall can maintain the construction safety; The symmetrical temporary central wall method and the parallel temporary central wall method are more favorable in structural safety and deformation control; In the case of parallel temporary central wall method, the scheme of driving the main tunnel and secondary tunnel simultaneously with some distance delay is the most costeffective, the quickest and the most environmentfriendly scheme, which can greatly improve the construction efficiency of doublearch tunnels; The comprehensive tunneling index of the mentioned scheme is increased by 107% compared to the conventional central pilot method,and by 79% compared to threepilot method. Analysis also shows that the excavation and support removing of the top heading is the key process in deformation control, and the joint between the arch of the secondary tunnel and the central wall and the joint between the invert of the secondary tunnel and the central wall are critical points in structural safety control.
Key words: doublearch tunnel, concealed central wall, selection of construction method, parallel temporary central wall
CLC Number:
U 455
LI Haijun, WANG Mingnian, ZHANG Wanbin. Discussion on Construction Method for Doublearch Tunnel with Concealed Central Wall[J]. Tunnel Construction, 2015, 35(12): 1271-1274.
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