水平加速度下围岩速度节点矢量敏感性分析

Sensitivity Analysis of Surrounding Rock Resistance Coefficient Activated by Horizontal Acceleration

拟静力分析方法作为隧道抗震分析的重要分支,一直作为工程界的热点研究问题。借鉴了地震工程中拟静力分析的方法,将地震力抽象成一个水平加速度,建立了一个适应节点速度矢量敏感性分析的计算模型。通过构建分析参量函数的方法,提取了内部支撑力的量、水平地震加速度、隧道埋深和半径之比、岩土体容重、岩土体黏聚力、岩土体内摩擦角的内部联系关系;将围岩抗力和地震加速度作为变量,埋深和半径之比等量为常量,在Bottero和Kummar的研究基础上进行了方法创新,获得了在不同条件下围岩速度节点矢量和地震加速度之间的变化关系。研究对高烈度地区的隧道衬砌设计,实现较好的经济效益有重要的帮助。

As an important branch of the seismic analysis,the pseudo static analysis method has been a hot research problem in the field of engineering.From the pseudo static analysis in earthquake engineering,the seismic force is abstracted into a horizontal acceleration,and the corresponding calculation model was established suitable to the sensitivity analysis of the velocity vectors.The constructing of the analysis parameters function absorbed the internal relations of the internal relations between the amount of internal support force,horizontal seismic acceleration,the ratio of soil bulk density,soil bulk density,and the internal friction angle of rock and soil were enlightened.The sensitivity analysis was innovated based on Kummar＇s and Bottero＇s theories,acquiring the relations between the velocity vectors with the seismic accelerations under different constant conditions.This study has an important significance for the design of tunnel lining in high intensity area and to realize better economic benefit.