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Comparison and Analysis of Temporary Support Schemes for the Middle Pilot Heading in a Multi-Arch Loess Tunnel
(1 Beijing Urban Construction Design and Development Group Co. Ltd., Chongqing 401120;
2 Civil Engineering and Architecture School of Chongqing Jiaotong University, Chongqing 400074)
Abstract When the bench method is used for the excavation of a multi-arch loess tunnel, steel rib support and backfill support are commonly used for the temporary support of the middle pilot heading. Using the Qingliangsi multi-arch tunnel on the Taiyuan-Jiaxian Expressway as an example, a comparative analysis of overall elastic-plastic simulation was carried out for those two kinds of supporting methods in order to select the most logical temporary support. The results show that the steel rib and backfill supporting methods have the same supporting effects on the surface displacement, crown settlement, and bolt axial force , and both of them can meet the requirements for tunnel deformation. However, the support provided by steel ribs in terms of the surrounding rock stress, initial support stress, and bolt axial force is better than that provided by the backfill support.
Abstract：
When the bench method is used for the excavation of a multi-arch loess tunnel, steel rib support and backfill support are commonly used for the temporary support of the middle pilot heading. Using the Qingliangsi multi-arch tunnel on the Taiyuan-Jiaxian Expressway as an example, a comparative analysis of overall elastic-plastic simulation was carried out for those two kinds of supporting methods in order to select the most logical temporary support. The results show that the steel rib and backfill supporting methods have the same supporting effects on the surface displacement, crown settlement, and bolt axial force , and both of them can meet the requirements for tunnel deformation. However, the support provided by steel ribs in terms of the surrounding rock stress, initial support stress, and bolt axial force is better than that provided by the backfill support.
YU Yuan-Quan-1,
Liu-Xiao-Lin-2,
Zhang-Xue-Fu-2
.Comparison and Analysis of Temporary Support Schemes for the Middle Pilot Heading in a Multi-Arch Loess Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(1): 138-143
2014, Vol. 51 