埋深及间距对近接并行隧道地震响应的影响研究
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摘要
利用FLAC有限差分程序,模拟在近场强震作用下双孔并行地铁隧道的地震响应。分析其相对位移差峰值、水平向加速度峰值、水平向应力峰值随埋深及隧道间距径比变化而变化的特性。结果表明:埋深对与隧道的相对位移差、水平加速度及水平应力有显著影响,且随埋深增加显著增大;而距径比影响不明显,只有在距径比等于1时,隧道相对位移差出现峰值。
The seismic response of the two holes parallel subway tunnels are simulated in near-field strong earthquake by FLAC finite-difference procedure.Analyzing the changing characteristics of the peak of displacement difference,horizontal acceleration and stress as the changing of depth and the specific value of pitch and diameter,the results show that: the depth can observably influence displacement difference,horizontal acceleration and stress,and the influence will increase as the depth increases;the specific value of pitch and diameter is less functionary than depth,only when the value is equal to 1 can the peak of relatively displacement difference appear.
引文
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