【作者】 李鹏；

【导师】 姜谙男；

【作者基本信息】 大连海事大学 ， 道路与铁道工程， 2012， 硕士

【摘要】 进入21世纪,地下空间这一宝贵的资源也越来越多的得到了人们的开发和利用,而地铁作为一种便捷、快速、环保的城市轨道交通运输工具,也在近年来大量的兴建起来。但由于地铁隧道所处的地质体具有复杂性和变异性的特点,施工过程对围岩及周围结构物的影响是不容忽视的。保证在新建隧道安全施工的基础上,又使既有的结构物保持正常使用是隧道施工中亟待解决的问题。本文结合大连地铁2号线香工街车站各施工阶段使用的工法,通过计算分析和现场监测的手段,对该车站开挖的稳定性及开挖对近接桥基的影响进行研究并指导施工。结合地质勘测资料和现场的施工监测数据,对该车站施工过程进行数值模拟研究,分析采用各工法围岩的稳定性。在CRD法模拟中,结合钙质板岩的三轴试验,采用摩尔库伦模型和应变软化模型对已开挖隧道的承载力进行计算,并比较两种模型的计算结果,得到含隧道路基的渐进破坏模式。在盖挖法数值模拟中,依据正交设计原理设计正交试验方案,并利用有限差分软件进行计算。计算结果采用极差分析法统计分析,分析各地层土体的物理力学参数的敏感性。在施工过程中,构建了远程自动化监测系统,实时监控数据并对数据进行处理,采用进化—支持向量机的方法,对监测数据进行滚动预测。结果表明：智能预测结果与实际监测结果吻合,并采用该方法预测了一次塌方,通过对地层进行注浆加固处理,保证了施工安全进行。香工街车站的研究成果,对近接施工理论提供了理论和工程依据,对现场施工具有重要的指导意义,也为类似的工程施工提供借鉴和指导。更多还原

【Abstract】 In the 21st century, with the appliance and development of underground space-avaluable resource, urban metro as a convenient, fast and environmental rail transport of modern cities, is being built in recent years. However geologic body which metro tunnel was located has the characteristics of complexity and variance, the influence of construction process to the surrounding rock and structures should not be ignored. On the basis of constructing the new tunnel safely, ensure the existing structures maintain normal utilization is a problem which need to be solved in the tunnel construction.By the means of calculation analysis and field monitoring, this paper, combined with the construction method of each excavation stage in the Xianggong street station of Dalian metro line 2, makes a scrutiny into excavation stability of the station and the influence of excavation on adjacent pile foundations, and then guides construction.Combined with the geological survey information and field construction monitoring data, the paper analyzed stability of surrounding rock with different construction methods based on the numerical simulation of construction process. In the simulation of center cross diagram method, combined with triaxial compression test on calcareous slate, the Mohr-Coulomb model and the Strain-Softening model are used to calculate the bearing capacity of excavated tunnel. After the simulation of the Strain-Softening model got the progressive failure pattern of tunnel roadbed bearing capacity, the paper compared the results of two methods with each other. In the numerical simulation of covered excavation method, according to orthogonal design principle, the paper designs the orthogonal design plan, and then the finite difference software FLAC3D is used to calculate. Using the extreme difference analysis for statistical analysis, the comparison of the difference of the sensitiveness of physical and mechanical parameters in the various soil formations was made in this paper.In the construction process, the remote automation monitoring system was constructed to monitor their real-time data as well as manipulate data at any moment. The monitoring data is used for roll forecast by the means of GA-SVM. The results show that:Intelligent forecast results are consistent with field monitoring results. This method forecast a collapse accident. Through grouting to strengthen strata, the safe excavation was achieved.The research of Xianggong street station provides the theory and engineering basis for adjacent construction theory, and has important guidance to field construction, and also provides reference and guidance for similar constructions.更多还原