Dynamic Effect Of The Du Mountain Tunnel Phyllite Surrounding Rocks

In recent years，with the rapid development of China’s economic construction,the construction of national highway passing day. After the "5.12" Wenchuanearthquake, with the depth of the reconstruction, a large number of tunnels across theearthquake area included in the construction plans, road tunnel constructiontechnology has put forward higher requirements. Construction process of highwaytunnels, the cavern surrounding rock mass to stress redistribution occurred, when thisre-distribution of the surrounding rock stress exceeds the ultimate strength will resultin instability and failure of the surrounding rock. Under seismic actions, the role ofthis stress is more significant impact on the stability of surrounding rock.This article made the numerical analysis and research for the Du mountain tunnelphyllite of surrounding rock and the lining seismic dynamic effects. By selecting theappropriate boundary conditions, the common aftershocks of seismic waves in thesimulated construction process to establish a reasonable calculation model using finiteelement analysis of tunnel surrounding rock and the lining of the seismic effects,discussing the laws of the dynamic response of the engineering. The comparativeanalysis of the bare hole tunnel surrounding rock, the early supporting and the foreverlining structure in the input level of seismic waves, under the conditions of thewater-rich phyllite and natural phyllite two surrounding rock of tunnel lining structureearthquake effect. In this paper, from the following aspects of the research, reachsome of the conclusions about Du mountain tunnel phyllite surrounding rocks and thelining structure seismic response:1. Read a lot of literature on the basis of the tunnel seismic research background, research status and development trends do a very comprehensive summary andelaboration;2.Establish the seismic dynamic analysis model of the tunnel, through thesimulation Du mountain tunnel bare hole seismic effects model, and concludes thatthe tunnel phyllite of surrounding rock in law of the action under the earthquakeresponse. By using the finite element software ANSYS to the power of thetime-history method, analysis of earthquake response of tunnel lining, and theinfluence of tunnel lining phyllite of surrounding rock stress and deformation factors(mainly moisture content) for the corresponding calculation and induction;3. Contrast to one thousand country rocks in the water-rich natural state dynamicanalysis, the water-rich phyllite affected by the earthquake;3. The depth of the underground structure of the dynamic response of the impact.Within a certain range, the underground structure of the greater depth, the better theperformance of the seismic safety;5. In the earthquake response analysis of underground structures, the upper andlower parts of the wall of the left and right sides of the tunnel lining structure prone tostress concentration, deformation is also large. From the entire structure, the liningstructure sidewall up and down at the end of the most prone to destruction, so take itseriously in the design and construction process to deal with these parts.