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| Study on Deformation and Supporting of Surrounding Rocks of Sabei Long-span Tunnel of Xi'an Metro |
| LIN Yun-hong |
| Guangzhou Metro Design and Research Institute Co. Ltd, Guangzhou, Guangdong 510010, China |
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Abstract Research purposes: Taking the tunnel project in the section between the Sajinqiao and North Main Street of the Line 1 of Xi an metro as an example, in this paper, the numerical analyses are made for the different construction processes by using the MIDAS GTS numerical simulation software to control the ground settlement and deformation and ensure the construction safety when the mine tunneling method is used for the metro interval construction. These different construction processes include the construction of no use of the anchor and grouting reinforcement, the construction of no use of the anchor but use of the grouting reinforcement and the construction of use of the anchor and grouting reinforcement. Besides, based on the in-site monitored data, in this paper, the study is done on the regulations of the surrounding rocks' settlement and deformation after the excavation of the large cross-sectional shallow loess tunnel and the analysis is made for the feasibilities of the CRD Method and the corresponding supporting measures.
Research conclusions: From the comparison of the numerical simulation results with the in-site monitored data, it is concluded: (1) For the shallow loess tunnel, it is proposed that it is unnecessary to use the arch anchor, and the sidewall anchor should be used according to the actual demand. (2)The grouting reinforcement can effectively control the strata subsidence caused by tunnel excavation for the shallow loess tunnel. (3)This research result can provide the reference the similar projects.
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Received: 11 January 2013
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2013, Vol. 30 
