| Due to the rapid development of many large and medium cities,the previous traffic system has been unable to meet the development needs,so many cities are committed to playing a three-dimensional underground highway.Due to the cross-tunnel may also be from the incident,reflection,diffraction and other seismic waves caused by the vibration,the harm is quite serious.Therefore,the article mainly considers the cross-tunnels which have been operated by earthquake-prone areas,analyzes the response law under the action of earthquake load,and then studies the seismic scheme.Firstly,the influence of the distance between the tunnel,the surrounding rock level and the depth of the tunnel on the seismic resistance of the tunnel is analyzed.The influence of the earthquake on the cross tunnel is reflected by the acceleration,stress and displacement response of the lining.Secondly,the sensitivity analysis of each influencing factor was carried out,and the factors influencing the cross tunnel lining were obtained by comparison.Finally,the seismic scheme of the cross tunnel is studied and compared.The paper mainly designs two kinds of seismic schemes:(1)to change the rigidity of the lining,including two lined with C40,C50 concrete two cases.(2)Between the initial and the second lining with a layer of foam concrete material isolation layer,the thickness of 20 cm,30 cm and 40 cm three cases.By comparing the shocks of the above five kinds of seismic solutions,a reasonable seismic scheme is selected. |
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