基于改进反应位移法的盾构隧道横向抗震规律研究

摘要

The seismic response of soil layer,in shield tunneling with small interval,influences structural internal force and deformation.However,the change of soil layer spring was not considered in the response deformation method.The improved method is proposed to reduce the error source of the original method.In our study,the model is completed with improved model,which is based on rational content of the original method.Moreover,the improved method is compared with the dynamic analysis method by numerical calculation,and theory model is fit out to modify the method further.The analysis results show that seismic law under two methods is basically consistent;when the interval between two tunnels is equal or greater than 8m,the variation of seismic response of shield tunnel is little,and this can be done by the original method.This theory model increases the accuracy of the results from improved method.%在地震动作用下,小间距盾构隧道夹土层区域的动力反应影响结构的内力与变形,而反应位移法未考虑夹土层弹簧参数的变化,本文针对这一误差来源,提出了改进反应位移法.一方面在反应位移法合理内容的基础上完善计算模型,另一方面通过数值计算将改进反应位移法与动力时程法进行对比分析,并拟合理论模型对改进的方法进行修正.结果表明,两种算法下结构的地震响应规律一致;间距d≥8m时,结构地震动反应变化不明显,可按反应位移法计算;理论模型提高了改进反应位移法计算结果的精度.