Study On Seismic Dynamic Response Of Oil And Gas Pipeline Tunnel

Peace and development are the themes of today's world,China also living in the important period of strategic opportunity,economic indicator as the representative of kinds of indicators are maintain a good upward trend.However,with the rapid development of China's economic,the conflict of domestic energy supply and demand has become increasingly prominent,and become a major problem restricting China's development.The construction project of Central Asia-China Gas Pipeline will greatly ease this problem,and protect China's energy security.Central Asia-China Gas Pipeline Line D as a construction project that still under construction,its construction is difficult and rare in the world,through a large number of mountains and rivers,and major parts in high seismic intensity area.Because of its strategic importance to China's energy security,the seismic problem of tunnel is even more highlighted the importance and necessity,so it is necessary to in-depth study and discussion on dynamic responses of oil and gas pipeline tunnel under high intensity earthquake.First of all,this paper summarize the seismic research methods for tunnels and underground structures,mainly form of tunnel seismic damage,and the influence factors that seismic response of tunnel.Then Central Asia-China Gas Pipeline Line D tunnel 5# as engineering background,based on the actual condition that the case of rock ? to structural design,modeling and calculating four different working conditions on the basis of the actual case by using ABAQUS finite element analysis software,analyze and summarize seismic dynamic response of tunnel with different surrounding rock,earthquake magnitude and overburden depth,and make some appropriate recommendations for this engineering.The conclusions are as follow:(1)Lining's peak stress and horizontal peak displacement is increased with reduce of level of surrounding rock under earthquake action.(2)With the increase of seismic intensity,the more energy released during an earthquake,resulting in various parts of lining significantly affected,and it has shown an increasing trend linearly in different surrounding rock.(3)The lager the tunnel overburden depth,it is less affected by the impact of earthquake.(4)When the tunnel overburden depth larger can significant reduce the adverse effect that surrounding rock texture caused by poor.(5)With the tunnel overburden depth increase,lining's peak stress is increased with growth of peak earthquake acceleration,and the stress value convergence finally.(6)With the tunnel overburden depth increase,the part that maximum stress appeared in lining from the arch to the wall.