USE OF ADVANCED GEOLOGICAL PREDICTION AND MONITORING MEASUREMENT TECHNOLOGY IN BJ-1 TUNNEL, GUIYANG

The BJ-1 tunnel is a municipal Engineering. It has shallow, bias condition, seriously weathered clay and shale, rock crushing, karst and groundwater development, underground pipelines and surface buildings intensive. So, the tunnel construction safety contained great risky. To ensure the safety of the tunnel construction, to protect surface buildings and the safety of the residents, it was very important to carry out the tunnel construction geological prediction and monitoring measurement. On the basis of analysis of the main engineering geological problems that may exist in the tunnel, the important and difficult geological prediction contents were determined. The comprehensive advanced geological forecast technology were put out. The geological methods were the basic methods. The ground penetrating radar and acoustic wave reflection method were the main geophysical means. According to the construction safety control needs, the implementation outline of the BJ-1 tunnel monitoring was formulated for construction safety control, focused on level convergence, vault sink, surface subsidence and blasting vibration monitoring. The monitoring and early warning system was established for the tunnel. By comprehensive analysis of advanced geological forecast and tunnel monitoring results, a reliable basis was given for the tunnel safety construction decisions. Dangerous incidents were avoided in the tunnel construction process. The research methods had important reference value for construction and design of similar city tunnel projects.