【摘要】 根据隧道地震安全性评价报告和地勘资料,建立了三维数值计算模型并采用一致粘弹性人工边界模拟动力边界,对高烈度地震区公路隧道洞口段进行了瞬态动力计算。计算结果表明:在三向地震荷载激励下,洞口段衬砌的地震响应具有明显滞后性,衬砌以水平横向振动为主,轴向振动次之,竖向振动最弱;洞口段衬砌的拱腰部位将承受极大拉应力和剪应力,可设减震层吸收地震能量;还通过对衬砌相对位移的分析得出,衬砌横向和轴向变形都很小,衬砌稳定性尚好。更多还原

【Abstract】 According to the report of seismic safety evaluation and the geological prospecting data of the tunnel,a three-dimensional numerical model is established with adopting viscous-spring artificial boundaries as the dynamical border,and a calculation is done for the highway tunnel entrance at the high-intensity earthquake zone.The calculation results show that the seismic response of the lining at the tunnel entrance has a lag far behind the three dimensional seismic load.Horizontal vibration level of lining is most obvious,and then the axial vibration,the vertical vibration is weakest.For the arch-waist of the lining will be under a great tensile stress and shear stress,a damping layer is placed to absorb the earthquake energy at this part. The lateral and axial deformations are small through the analysis of the relative displacement at lining,so the lining is stable.更多还原