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| Study on Optimization of Excavation and Support Parameters for Deep －buried Super － large Span Single － arch Tunnel |
| KANG Fu － zhong1，HE Shao － hui2，ZHANG Qi3，CAO Rui － lang2 |
| 1． CABR，Beijing 100013，China; 2． Beijing Jiaotong University，Beijing 100044，China; 3． China Railway Sixth Group Co． Ltd，Beijing 100036，China |
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Abstract Research purposes: The Badaling Four － line － way Tunnel of the new Beijing － Zhangjiakou Railway is the first tunnel with so large span in China，featured with the span of 27． 3 m，the height of 18 m and the cross section area of 386． 56 m2 ． For excavation，the following four excavation methods were planned: the single － wall pilot method，the single rock column method，the CRD four － hole method and the six － hole CRD method． The finite element software was used to make the simulation calculation of the excavation and support processes with the four methods mentioned above for the purpose of getting the optimal construction scheme．
Research conclusions: From the comparison of the seven parameters of the maximum drawing and compressive stresses，the vault settlement，the ground settlement，the axial force of the anchor arm and the maximum drawing and compressive force of the lining，it can be seen the single － wall pilot method is the optimal excavation method，followed by six － hole CRD method，based on taking the 0． 3 m thick spraying concrete lining and 5 m long anchor arm as the support paramters． The research result is reasonable and has the reference to the design and construction．
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Received: 18 March 2012
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2012, Vol. 29 
