地下水水位上升对地铁隧道结构的影响分析  

Numerical Analysis on the Influence of the Rising Groundwater Level on the Metro Tunnel Structure

作　　者：罗富荣[1,2] 刘赪炜[3] 韩煊[3] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]北京市轨道交通建设管理有限公司,北京100037 [3]北京市勘察设计研究院有限公司,北京100038

出　　处：《中国铁道科学》2011年第1期81-85,共5页China Railway Science

基　　金：国家科技支撑计划项目(2006BAJ27B04);北京市科技计划项目(D08050600390802);北京市优秀人才培养专项资助项目(2008F-13)

摘　　要：在分析北京地区地下水水位上升情况的基础上,采用FLAC数值模拟方法,以拱顶埋深6 m、直径10 m的地铁隧道为例,研究地下水水位逐步回升情况下,隧道结构在位移、变形、内力(弯矩和轴力)、塑性区等方面的变化趋势和分布规律。分析结果表明,在地下水水位明显回升的情况下,隧道发生整体上浮、结构整体破坏的可能性不大,但会使隧道结构的内力(弯矩和轴力)发生变化,并且产生变形,会对地铁结构产生一定的影响。这些变化甚至有可能引起结构的开裂、渗水以及由此带来的一系列问题。因此在进行地铁、地下结构的规划、设计和施工过程中应对地下水的变化给予重视。Based on the analysis of the rising groundwater level in Beijing area, FLAC numerical simulation method was adopted to analyze a given case of the metro tunnel, in which the depth and diameter was 6 and 10 m respectively. The variation trends and the distribution laws of the displacement, deformation, internal force （moment and axial force） and plastic zone of tunnel structure, etc. during the rising of groundwa- ter level step by step, were studied. Analysis results show that there is little possibility that the tunnel is overall floating and the whole structure is destroyed as the groundwater level is rising remarkably. But the rising groundwater level will change the internal force （moment and axial force） of the tunnel structure and the deformation may occur, which will have definite impact on the metro structure. These changes can even make the structure crack, seep, and cause a series of problems. Thus, importance should be attached to the change of groundwater level in the planning, design and the construction of metro and underground structure.

关 键 词：隧道结构 地下水 水位上升 结构内力 变形 位移 

分 类 号：TU452[建筑科学—岩土工程]