大跨地铁风道导洞开挖的地表沉降分布规律研究

发布时间：2018-05-21 02:19

本文选题：地铁大跨风道 + PBA工法　；参考：《铁道标准设计》2017年02期

【摘要】：北京地铁8号线大红门桥站-和义站区间附属风道为跨度16.2 m的单跨结构,采用暗挖洞桩法(PBA工法)施工。为有效控制导洞开挖引起的地表沉降,必须合理安排导洞施工顺序。基于三维数值模拟方法对不同的导洞开挖方案地表沉降分布规律进行研究,并与地表沉降监测结果进行比较分析。结果表明:不同的导洞开挖顺序的地表沉降发展路径差别显著,但最终的沉降值基本一致;随着导洞的开挖,地表沉降槽宽度增加并不明显,但是由于导洞开挖的群洞效应,地表沉降速度发展较快。因此在后续的拱部开挖支护中,必须通过调整支护措施和开挖方案来严格控制地层沉降。
[Abstract]:The subsidiary wind tunnel of Dahongmen Bridge station and Yi Yi Station of Beijing Metro Line 8 is a single span structure with a span of 16.2 m, which is constructed by the method of dark hole pile (PBA). In order to effectively control the surface subsidence caused by the excavation of the guide tunnel, the construction order of the guide tunnel must be reasonably arranged. Based on the three-dimensional numerical simulation method, the surface settlement distribution rules of different guide tunnel excavation schemes are made. The law is studied and compared with the results of surface subsidence monitoring. The results show that the path of surface subsidence development of different excavation sequence is distinct, but the final settlement value is basically the same. With the excavation of the guide tunnel, the width of the surface subsidence trough is not obvious, but the velocity of the surface subsidence due to the cave effect of the tunnel excavation and the velocity of the surface subsidence Rapid development, therefore, in subsequent arch excavation and support, we must adjust the supporting measures and excavation plans to strictly control the ground settlement.
【作者单位】：北京城乡建设集团有限责任公司;北京交通大学土木建筑工程学院;
【基金】：北京城乡建设集团有限责任公司科技研究开发计划项目(2015-01)
【分类号】：U231.3;P642.26

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