拟静力法地下通道抗震验算

Pseudo Static Method in Seismic Checking of Underground Passage

地下通道的地震作用计算,规范中较少论述,现借以编制通道国标图集之契机对此做一些探讨。浅埋地下通道地震时所受地震加速度和地面相同,按静力法计算。但它不是刚体,是埋在土内各部位受到地震力、重力、填土重力和抗力的共同作用,产生了内力和变形。它是处于弹性土体内,弹性地基上的弹性闭合框架。对于这样一种结构的计算,本文以结构力学理论运用实用计算方法作出尝试,对于图集的编制起到试算和演练作用。

The calculation of the seismic action of the underground passage is seldom discussed in the speci-fication.Now we take the opportunity to make some discussion on it by compiling the standard drawings of the underground passage.The channel is shallow buried underground,and the seismic acceleration is the same of the ground during the earthquake,which is calculated according to the static method.However,the channel is not a rigid body,under the combined action of seismic force,gravity,backfill gravity and resistance on various parts buried in the soil,resulting in internal force and deformation.It is a closed elastic frame in the elastic soil and on the elastic foundation.To calculate such a structure,the practical calculation method based on the struc-tural mechanics theory was used in this paper,which played a trial and exercise role in the preparation of stand-ard drawings.