圆形隧道抗震计算的近似方法

本文提出了圆形水底隧道抗震设计的近似计算方法。其基本思想是衬砌与土体的变形与它们之间的相对刚度有关。通过计算土体的位移,再采用传递系数,来计算衬砌的变形,最后求出衬砌的内力。而传递系数是Peck提出的柔度比或类似压缩比的函数。文中还简介了St.John的计算方法。并对SFBART的设计实例,按建议的方法进行计算,还将计算结果与St.John和SFBART的结果做了比较。

An Approximate Method for Aseismic Calculation of Circular Tunnels

Based on that displacements between liner and soil depend upon their relative stiffnesses, an approximate calculation method for the aseismic design of circle subaqueous tunnel is presented. The procedure carries out as follows: calculating soil displace- ment, determining liner deformation with the use of a transfer coefficient, and finally worikng out stresses in the liner. The transfer coefficient is a function of the floxibility ratio F pres- ented by Peck. St. John's calculation method is also introduced briefly. The proposed method is applied to SFBART's design example and the calculated results are compared to those of St John's and SFBART's.