【作者】 周成君；

【导师】 樊有维；

【作者基本信息】 南京林业大学 ， 岩土工程， 2010， 硕士

【摘要】 研究软土地区盾构隧道施工对周围地下管线的影响,分析地下管线的力学及变形性状,具有较为重要的理论意义与实用价值。本文主要采用理论分析和数值模拟相结合的方法,对盾构隧道施工影响下的地下管线性状进行研究,并分析了管线位移的影响因素。主要研究内容如下:(1)采用弹性地基假定,基于Peck修正公式和Attewell经验公式,使用初参数法,推导了盾构隧道施工影响下,垂直和平行于盾构隧道的刚性接口地下管线的竖向位移与力学性状求解公式。(2)按管线与隧道垂直及平行两种情形,分析了盾构隧道施工对柔性接口地下管线位移与转角的影响,并给出了各接口处的相对转角与相邻接口位移之间存在的关系。(3)提出了一种基于经验公式的变形控制安全性评价方法,建立了管线变形指标和地面最大位移之间的直接联系。通过管线的允许变形值反求出地面变形的允许值,以达到由地面位移间接控制管线变形的目的,实现对管线的安全监控。(4)利用Plaxis 3D Tunnel有限元软件,分为管隧垂直与平行两种情况,建立了三维数值模型,模拟了盾构隧道施工对刚性接口地下管线的影响。(5)采用数值计算方法,按管隧垂直、管隧平行两种情形,分析了土质参数、管线参数、施工参数对地下管线力学性状的影响规律。更多还原

【Abstract】 Estimating the effect of shield tunnel construction on adjacent buried pipelines in soft soil areas, Giving a study on this research subject has important theoretical significances and utility value. the method of theoretical analysis and numerical simulation were adopted respectively to research the displacement and force of adjacent buried pipelines effected by shield tunnel construction. The research also analysed the influencing factors of displacement of pipelines. The main research results are as follows:(1)Adopting the elastic foundation beam theory, by Peck modified formula and Attewell empirical formula, using the method of initial parameter, the solution formulas of vertical displacement and mechanics properties of rigidly jointed pipelines effected by shield tunnel construction were derived in two different cases (pipeline transverse to the tunnel and pipeline parallel to the tunnel).(2)In the two different cases (pipeline transverse to tunnel and pipeline parallel to the tunnel), the effect of shield tunnel construction on the displacement and rotation angle of flexible jointed pipelines was analysed. Then the relationship of relative rotation angle in every joint and displacement in adjacent joints was given.(3)Direct relation between pipeline deformation index and maximum ground surface displacement is established and a new deformation control method is put forward based on empirical formula to overcome the weakness of previous damage evaluation method, which only take ground displacemen as assessment index. Ground surface allowable deformation is attained by using allowable deformation value of pipelines to achieve the goal of controlling pipeline deformation through ground surface displacement and protect the pipeline.(4)Using Plaxis 3D Tunnel finite element software, 3-D numerical models were established to simulate the effect of shield tunnel construction on rigidly jointed buried pipelines in the two different cases (pipeline transverse to tunnel and pipeline parallel to the tunnel).(5)In the two different cases (pipeline transverse to tunnel and pipeline parallel to the tunnel),the change laws of displacement of rigidly jointed buried pipeline effected by shield tunnel construction were studied under different factors(soil、buried pipeline、construction).更多还原