Study On Explosive Construction And Monitoring Technology Of The Shallow Tunnel

Shallow buried tunnel always located at tunnel portal section. Because of theweather and crushing rock, the shallow buried bias tunnel was unstable and becamethe key point of the tunnel construction. With the perturbation of blasting shockwave, many engineering accident had been happened during the construction ofshallow buried tunnel portal section.This paper based on auxiliary emergency line Gun-tiangou tunnel、Dong-guanNo.1and No.2tunnel which combined the field monitoring results and numericalsimulation result to discuss the stability of shallow buried tunnel portal section. Andit also studied the important factors which infect the stability of tunnel. This paperfocused on how to determine the construction and supporting parameter. Based onthe monitoring data to research surface vibration rules and tunnel’s dynamicresponse under the blasting shock wave.This paper summary characteristics and formation of shallow buried tunnel andmonitored the surrounding rock stress and supporting internal force. Based on thedata of monitoring, it research the mechanic property of shallow buried tunnel. Itused finite element software MIDAS-GTS to simulate the process of tunnelconstruction and summery the deformation and stress distribution law of differentprocess of tunnel construction. It combined the monitoring data and numericalsimulation results to study the tunnel stability. At the same time, this papermonitoring the surface vibration to research the law of seismic wave propagation. Itdiscussed the surface vibration and displacement time history and stress distributionto research the dynamic response of the shallow buried tunnel under the blasting load.Combing with theory， raise the technology of Gun-tiangou tunnel blastingexcavation and Dong-gun No1tunnel mechanical excavation.