浅埋隧道衬砌结构地震侧压力的拟动力法求解

Pseudo-dynamic analysis for seismic lateral pressure of lining structure of shallow tunnel

地震对浅埋隧道的衬砌结构有较大影响,研究分析地震发生时衬砌结构的侧向压力是十分必要的。采用基于水平层分析法的拟动力法,考虑地震加速度的放大效应,推导出衬砌结构地震侧压力的基本方程,并结合工程实例编制数值积分程序进行计算分析。计算结果表明,随着破裂角与时间周期比的增大,衬砌结构的地震侧压力合力先增大后减小,地震侧压力呈非线性分布,拟动力法计算出的地震侧压力分布比较符合实际,可作为高烈度区隧道衬砌结构的抗震设计依据。

The earthquake has a great impact on the lining structure of shallow tunnel,and it is necessary to study the lateral pressure of the lining structure during the earthquake. The basic equation of seismic lateral pressure of lining structure is deduced by using the pseudo dynamic method based on the horizontal layer analysis method and the amplification effect of the seismic acceleration is considered,and the numerical Integration program is compiled and analyzed with engineering example. The calculation results show that with the increase of the rupture angle and the time period ratio,the seismic lateral pressure of the lining structure increases firstly and then decreases,the seismic lateral pressure is nonlinear distribution,and the seismic lateral pressure distribution calculated by the quasi dynamic method accords with the actual,which can be used as the seismic design basis of the tunnel lining structure in the high intensity seismic area.