ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2015, Vol. 35 ›› Issue (6): 508-513.DOI: 10.3973/j.issn.1672-741X.2015.06.003
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LI Bo, SONG Ye, SHI Yalong, LIU Zhiqiang
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Abstract:
Experimental study is made on 5 construction methods of large crosssection loess tunnels, including CRD method, doubleside drift method, CD method, corereserved bench method and doublelayersupport bench method, with Qindong tunnel, Tongluochuan tunnel and Gaoqiao tunnel on ZhengzhouXi’an passengerdedicated line as examples. The mechanical and deformation characteristics of the tunnels constructed by different construction methods are analyzed on basis of site measurement and data analysis. Conclusions drawn are as follows: the deformation of the loess tunnel is featured with significant vertical displacement, and the deformation is significantly affected by the closure distance and the support rigidity; The analysis on the ground surface settlement control effect shows that the shaped steel is under significant pressure and the bolt is under small force; The characteristic curves of the pressure of the surrounding rock under different depths are gained; The measurement of the contact pressure indicates that the doublelayer support structure, which has larger rigidity, has smaller contact pressure than the singlelayer support. In the end, compressive evaluation is made on the applicability of the construction methods studied.
Key words: large crosssection loess tunnel, ZhengzhouXi’an passengerdedicated line, CRD method, doubleside drift method, CD method, corereserved bench method, doublelayersupport bench method, mechanical characteristics, deformation characteristics
CLC Number:
U 45
LI Bo, SONG Ye, SHI Yalong, LIU Zhiqiang. Study on Mechanical and Deformation Characteristics of Large Crosssection Loess Tunnels Constructed by Different Methods[J]. Tunnel Construction, 2015, 35(6): 508-513.
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http://www.suidaojs.com/EN/Y2015/V35/I6/508