Construction Technology Of The Tunnels With Very Bad Geological Situation, Overburden Is Very Thin, Receive Side Direction Pressure

In country's railways, highways, municipal, water and electricity projects, often encountered bias in shallow tunnels in soft rock. Such tunnel construction method since the 1980s, with the new Austrian law principle of application, Supporting construction methods developed by leaps and bounds. Take advance bracing, steel radial anchor, network sprayed concrete, rapid and effective support measures, effectively enhance the self-stability of the rock, greatly accelerate the construction schedule, safety, quality has been strong protection. Current domestic and foreign industries except construction methods and technical tools have more progress, Tunnel Construction increasing emphasis on geological forecasting. In addition to conventional drilling ahead, in recent years the large-scale application of geophysical methods, such as seismic refraction, Sonic reflection method for the construction of geological prediction.In order to make construction safer and more rapid, high-quality, and enhance economic efficiency, this paper systematically to such tunnels key technologies (advance support and reinforcing the tunnel excavation, Monitoring and drainage tunnels, etc.) were studied. And the use of finite element shallow right height bias Tunnel construction of the initial advance and strengthen the supporting structure for simulation, proved that the construction of such tunnels used the method is feasible.Finally, the stability of the rock excavation and shallow tunnel construction mechanical bias on the basis of, the Chongqing-Huaihua railway tunnel sharp slope of reasonable engineering construction technology program for the whole of the construction safety and provide a reliable theoretical basis and ensure the smooth, future projects of similar design and construction have some reference value.