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结合“隧规”改革工作,我们对参加修建2107线的5751部队等单位进行了学习调查,现将隧道施工、隧道选线、隧道结构型式等问题的调查纪录整理如下: 一、隧道施工 1.开挖与支撑 (1)有一段隧道为变质岩层,被火成岩穿插侵入,岩质较差,片理性较大,含云母及绿泥质较多,易风化,受水易软化,易顺层理滑动(f=1～1.5及2～3)。该段中长短隧道采用上下导坑先拱后墙法施工,也有个别短隧道采用上导弧形导坑先拱后墙法施工。边墙开挖及砌筑,地质好(f=2～3),拉短距离中槽再跳挖马口做边墙,
In combination with the “TGP” reform work, we conducted a study survey on units participating in the construction of the No. 2 075 line of the No. 2107 line. The survey records of tunnel construction, tunnel alignment and the type of tunnel structure are summarized as follows: I. Tunnel Construction 1. Excavation and support (1) There is a section of tunnel for the metamorphic rock, intrusive igneous rock intrusive, poor rock quality, rational film, mica and chlorophyll more, easy to weathering, easily softened by water, easy to layering Slide (f = 1 ~ 1.5 and 2 ~ 3). The length of the tunnel section using the upper and lower pits before arch arch wall construction, there are also a few short tunnel on the arc-shaped guide arch first back wall construction method. Side wall excavation and masonry, good geological (f = 2 ~ 3), pull the short slot and then dig the horse mouth to do the wall,