【作者】 范炳杰；

【导师】 张庆贺；

【作者基本信息】 同济大学 ， 结构工程， 2008， 硕士

【摘要】 随着现代化城市建设的快速发展,我国诸大城市纷纷兴起了大规模建设地下铁道的热潮,大量的地铁车站深基坑工程也随之出现。支撑体系的设计是地铁车站深基坑工程的关键部分,其设计合理与否直接影响着基坑工程的安全性、经济性以及施工进度。本文依托上海市轨道交通杨浦线杨思站基坑工程为背景,对地铁车站深基坑支撑体系参数的优化进行了计算分析研究,主要内容和结论如下:(1)调研总结了我国目前深基坑工程中常用的支撑体系,并对其优缺点进行了分析比较,提出了适合于地铁车站深基坑的支撑体系。(2)分析总结了目前基坑工程中常用的支撑接头,在比较以往支撑接头优缺点的基础上,提出了一种新型的易于施工的支撑接头——活络头。并对该活络头进行了受力分析,提出了试验研究方案。(3)利用有限元法对基坑支撑体系的刚度、水平间距、施工顺序、平面布置形式等参数进行了计算分析,得出了上述支撑参数对于基坑强度、变形、稳定性的影响规律;研究还发现整体刚度、道数、末道支撑位置、水平间距、布置形式、架设时间、施工顺序、预加应力对墙体最大水平侧移较敏感;整体刚度、首道支撑刚度、首道支撑位置、道数、水平间距、施工顺序、预加应力对墙顶水平侧移较敏感:整体刚度、水平间距、道数、末道支撑位置、架设时间、布置形式、预加应力对墙体内力较敏感;整体刚度、支撑设置道数、水平间距、施工顺序对地表沉降较敏感。(4)运用前面得出的规律,针对杨思站深基坑工程的支撑体系进行了计算分析和优化。对计算结果与实际监测数据进行了对比,说明优化的方法是可行的;由于方案的优化使得该基坑工程达到了更好的经济性、施工安全性。更多还原

【Abstract】 With the rapid development of urban construction, many cities have the rise of construction of the metro, and a large number of deep excavations also will be there. Design supporting system is a key part of deep excavation in metro station and whether its design is reasonable or not directly affects the safety, economics and construction progress of excavations.Relying on the Yangsi station of metro Yangpu Line in Shanghai, the paper optimized the supporting system parameters of deep excavation in metro station,the main content and conclusions are as follows:(1)Summed up the supporting systems commonly used in deep excavation , and analyzed their advantages and disadvantages. Proposed the supporting systems for deep excavation in metro station.(2)Analyzed and summarized the support joints commonly used in deep excavation. On the basis of the comparison of the advantages and disadvantages of the previous support joints, a new type of support joint was proposed. An experimental programme was proposed.(3)With the finite element method, calculated the parameters of supporting system such as stiffness, level spacing, excavating sequence, arrangement form and so on and drawed the laws of strength and deformation, the stability for excavation. The study also found that the integral stiffness, numbers, last support position, level spacing, arrangement form, erected time, excavating sequence, pre-stressed are more sensitive to the horizontal displacement. Integral stiffness, first support stiffness, first support position, numbers, level spacing, excavating sequence, pre-stressed are more sensitive to the top horizontal displacement. Integral stiffness, the level spacing, numbers, first support position, erected time, arrangement form, pre-stressed are more sensitive to internal force. Integral stiffness, numbers, level spacing, excavating sequence are more sensitive to the surface settlement.(4)Using previous laws, calculated and optimized parameters of supporting system in Yangsi deep excavation. The comparison of the calculation results with the monitoring data proved that the optimization method is feasible. Better economics and construction safety were achieved because of the optimization.更多还原