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Response of a double-decked metro tunnel to shield driving of twin closely under-crossing tunnels

机译：双层地铁隧道对双交叉隧道的盾构驱动响应

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摘要

Twin tunnels on Shenzhen metro Shekou Line were driven by EPB shields through weathered granite gneiss closely under-crossing a double-decked tunnel embedded in strongly weathered granite gneiss on Luobao Line. The performance of the existing tunnel as affected by under-crossing tunnels was con tinuously monitored by means of an automatic high-performance total station measuring system. Dis placements of the existing tunnel caused by under-crossing tunnels in different under-crossing stages were measured. The measured data were timely processed and fed-back to related operators to realize an information-oriented project. Based on the measured data discussions and analyses were carried out in terms of the impact of the under-crossing shield tunnelling on the existing tunnel, effect of rainfall infiltration on the performance of the existing tunnel, allowable deformations of the existing tunnel, pos sibility of reducing the number of measuring points in a monitoring cross section and the influence on the existing tunnel caused by twin tunnels. Thanks to the staggered single tunnel under-crossing and other favorable factors, the measured deformations of the existing tunnel were well below the predefined allowable values. Under the guidance of monitoring, the under-crossing project was smoothly completed without interruption of metro traffic. This is a valuable example for evaluating the shield tunnelling induced effects on adjacent existing tunnels and establishing criteria to guide shield tunnelling under similar conditions.
机译：深圳地铁蛇口线的双隧道是由EPB盾构穿过风化的花岗岩片麻岩，紧接在罗堡线强风化的花岗岩片麻岩中的双层隧道下方。借助自动高性能全站仪测量系统，连续监测受穿越隧道影响的现有隧道的性能。测量了在不同的跨底阶段由跨底隧道引起的现有隧道的位移。及时对测得的数据进行处理并反馈给相关的操作人员，以实现信息化项目。在实测数据的基础上，讨论了地下穿越盾构隧道对既有隧道的影响，降雨入渗对既有隧道性能的影响，既有隧道的允许变形，可能的变形等方面的讨论和分析。减少监测断面中的测量点数量以及双隧道对现有隧道的影响。由于交错的单个隧道穿越不足和其他有利因素，现有隧道的实测变形远低于预定的允许值。在监控的指导下，跨界工程顺利完成，地铁交通没有中断。这是评估盾构隧穿对相邻现有隧道的影响并建立标准以指导类似条件下的盾构隧穿的有价值的示例。

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