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中文摘要：
为解决多条近接隧道施工时后行隧道开挖对先行隧道结构造成的不利影响,以天津地铁5、6号线四线交汇隧道为研究对象,选取典型复杂断面,采用数值软件FLAC3D,模拟富水地层中四线交汇隧道开挖时隧道结构之间的相互影响规律。结果表明：该复杂断面处,后行隧道施工使先行隧道整体位移具有偏向开挖隧道移动的牵引趋势,且先行下部隧道竖向整体位移较横向整体位移变化更为显著。在渗流作用下,先行下部隧道施工产生的地表沉降量及沉降范围相比后行上部隧道较大,验证了富水地层中渗流作用对土体变形影响程度及范围均远大于开挖应力释放的影响。
英文摘要：
The excavating tunnel has an adverse effect upon the excavated tunnels during the construction of multiple adjacent tunnels. In this paper,the typical cross-section of the connection section between Line No. 5 and Line No. 6of Tianjin Metro is analyzed by means of FLAC3 D software; and then the interaction of excavating the four adjacent shield tunnels in water-rich stratum is simulated. The results show that： 1） The excavated tunnels incline to the excavating tunnel. The vertical displacement of lower-laid tunnel is more obvious than the horizontal displacement. 2）The ground surface settlement and the settlement scope induced by lower-laid excavated tunnel are larger than that induced by upper-laid excavating tunnels under seepage action; and it is proved that the influence of seepage action on water-rich ground settlement and settlement scope are larger than those of excavation stress releasing.
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