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中文摘要：
新线隧道近距离穿越既有隧道是城市地铁网开拓中的重点和难点,具有重要研究价值。根据交叠隧道的变形特点,提出了计算既有隧道衬砌变形和内力的理论模型,推导了新线隧道近距离开挖穿越时,既有隧道衬砌变形和内力的相关计算公式,并对既有隧道衬砌拱底变形槽反弯点处的沉降量和最大下沉坡度角的计算结果进行了分析。以青岛市地铁交叠隧道工程为背景,通过一系列数值仿真试验分析了理论公式计算结果的可靠性和合理性。
英文摘要：
That new tunnels go across the old ones with short distance between them are the focus and difficult points in development of subway networks,which is of great significance of research.According to the characteristics of deformation in overlap tunnels,the theoretical model for calculating the lining deformation and internal forces in existing tunnels was proposed.The related formula for calculating the lining deformation and internal forces in existing tunnels while the new tunnels came to dig in close vicinity to old ones was derived,then,the calculating results of the settlements and maximum angles of subsidence slope at the point of deformed trough of lining arch abutments in existing tunnels were analyzed.The reliability and rationality of the computation with theoretical formula were verified through a series of numerical simulation tests against the background of Qingdao overlap tunnels.
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