【作者】 周伟；

【导师】 李小青；

【作者基本信息】 华中科技大学 ， 道路与铁道工程， 2006， 硕士

【摘要】 随着我国经济的发展,城市人口急剧增加,在城市建设过程中为了减少对人们正常活动的影响,越来越多的采用隧道。隧道施工不可避免地会引起地面沉降,当地面沉降到一定程度时,将影响地面建筑物和地下管线的正常使用。为减少地面沉降对周围环境的不良影响,必须对地面沉降进行预测。随着计算机的快速发展,对于隧道施工引起的地面沉降,采用有限元软件进行数值分析得到了广泛的应用。在相关理论的基础上,采用有限元软件ADINA进行隧道施工数值分析,模拟隧道开挖引起的地面沉降,分析在不同条件下相关因素对地面沉降的影响。首先,对隧道开挖引起的地面沉降理论进行研究,并建立隧道施工引起地面沉降的有限元数值仿真模型;其次,对几种常用的土体本构模型进行对比分析,比较不同模型下隧道开挖引起的地面沉降,选择适合隧道施工数值分析的土体本构模型;然后,对于不排水和排水两种不同条件下隧道开挖引起的地面沉降进行对比分析;最后,对影响隧道地面沉降的主要因素进行对比分析,得出各影响因素的影响程度大小。通过仿真分析,给出ADINA平台下的隧道开挖有限元仿真模型及其相关条件,得出不同因素对地面沉降的影响范围和影响程度。对于在施工过程中控制地面沉降、保护地面建筑物和地下管线等具有重要的意义。更多还原

【Abstract】 With the development of our country’s economy, the population in cities increasing rapidly, more and more tunnels are used in order to reduce the influence to people’s natural activities during the city constructions. The ground settlement induced by tunnel construction is inevitable, it will affect the regular service of the buildings on the ground and the pipelines underground when it is in certain extent. To reduce the adverse effects on the around environment, it must forecast the ground settlement. And with the rapid development of the computer, it is popular to do the numerical analysis using the finite element software to forecast the ground settlement induced by tunnel construction.Basing on correlative theories, it adopts the finite element software ADINA to do the numerical analysis on the tunnel construction, simulating the ground settlement induced by tunnel construction, analyzing the influence of correlative factors to the ground settlement under different conditions.Firstly, the theories about ground settlement induced by tunnel excavation are researched, the finite element simulation model about ground settlement induced by tunnel construction is built; secondly, constitutive models of soil body that common used are analyzed, the ground settlement induced by tunnel excavation under different models is compared and choose a better one to do the simulation; thirdly, the ground settlement under drained and undrained are compared; lastly, the main factors that affect the ground settlement are analyzed and got the extent of the influence of different factors.Though the simulate analysis, the finite element simulation model and correlative conditions of tunnel excavation under ADINA are given, the extent and the range of the influence of different factors to ground settlement are got. It will have important significance to control the ground settlement in order to protect the buildings on the ground and the pipelines underground during the construction.更多还原