3-D Elasto-plastic Numerical Simulation of Evolving Regularity of Structural Internal Force of Overlapped Tunnels
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摘要: 为了探讨重叠隧道近接施工引起的结构内力演变规律,以深圳地铁老街—大剧院区间重叠隧道为背景,进行了三维弹塑性有限元分析.考虑了“先上洞,后下洞”和“先下洞,后上洞”2种施工顺序.研究结果表明:随着后施工隧道的掘进,先施工隧道的环向内力发生偏转,产生纵向内力,并呈现明显的波动性以及受开挖影响的局域性和临时性;后施工隧道的纵向影响范围,在Ⅲ级围岩中约为3倍洞径,在Ⅴ级围岩中约为5倍洞径.Abstract: To investigate the evolving regularity of structural internal force governed by tunneling of overlapped tunnels,3-D elastic-plastic numerical simulations were conducted on two overlapped tunnels in Laojie-Dajuyuan section of the Shenzhen metro.Two construction schemes,i.e.,up-to-down or down-to-up tunneling procedures,were taken into account.The research result shows that the circumferential internal force of the constructed tunnel deflects when an overlapped tunnel to be constructed is driven,and the longitudinal internal force appears.Evolution in the longitudinal internal force has a fluctuant,local and temporary characteristic with the driving of the subsequent tunnel.The longitudinal effect is confined within three times tunnel diameter in class Ⅲ surrounding rock and five times tunnel diameter in class Ⅴ surrounding rock.
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