近接浅埋偏压黄土隧道支护结构的力学特性分析研究

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Abstract Research purposes: The purpose is to ensure the safety of new tunnel construction and service safety of existing tunnel when constructing a new double—track tunnel in close proximity to the existing tunnel in parMlel．

Research conclusions:(1)Under the shallow bias conditions．the settlement and convergence of the arch of newly—built tunnel are big．(2)The rock pressure distribution is asymmetric like eat ears．(3)The stress on the farther side of the steel bow member is bigger than that on near side of the steel bow member and it plays a big role in supporting．(4)The Arch and side walls with sprayed concrete are in compression while the tensile stress i8 over the bottom．(5)The stress on the anchors of the arch system is small and it produces a little effect on the stability of the structure while the foot anchors produce a certain effect on the structural stability．(6)The existing tunnel is obviously affected by excavation of the new tunnel because excavation of the new tunnel produces two effects of bias and tension on the existing tunnel．(7)The distance between the proximite tunnels produces big effect on the existing tunnel lining．When the space iS fixed，the impact on the near side iS bigger than that on farther side．

Key words： proximate tunnels loess tunnel shallow bias monitoring numerical simulation mechanical Characteristics

Received: 01 September 2010

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U25

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http://tdgcxb.crec.cn/EN/ OR http://tdgcxb.crec.cn/EN/Y2010/V27/I11/61

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