地下综合体深基坑施工环境影响及保护研究
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摘要
在上海的城市规划中,准备建设以地铁枢纽为中心的地下大型综合体。由于地下综合体的开发都处于市中心繁华地带,建筑物鳞次栉比,进行这类地下综合体的开发会对周围环境造成不利影响。环境保护问题已成为工程设计和施工中的重点问题,而变形控制则是其成功的关键。为了保护深基坑邻近建筑物的正常使用和安全,对上述问题进行深入研究显得尤为迫切,并具有重大的现实意义。为此,本文完成的如下主要工作:
     (1)基于实测数据,研究了坑周地层变形规律:并运用有限差分法数值模拟,研究了邻近大刚度地下构筑物基坑位移场与一般基坑位移场,并进行比较分析,得出了一些有意义的结论。
     (2)通过大量调研、个案研究、国内外相关研究成果归纳总结和批判吸收基础上,对地下综合体施工中的普遍性问题进行了研究。
     (3)针对基坑开挖位移传递规律,对不同影响程度进行影响分区,并提出了分区表达式。对表达式的各个影响系数进行分析,并进行了对策分析。
     (4)通过上海地铁深基坑工程的大量实践、实测数据和理论分析,总结了工程基本概况以及各工程所能达到的环境保护等级。建立了环境保护等级与分区影响系数值之间的对应关系。为今后类似工程进行影响分区,估算建筑物的影响程度提供依据。
     (5)在对建筑物与地下管线在差异沉降受力与变形进行分析的基础上,总结分析了坑周建筑、地下管线及地铁运营车站的变形控制标准,并提出了用于坑周建筑及地下管线的工程保护措施。
     (6)对明珠线二期上体场站穿越施工各个阶段车站结构的受力进行了三维有限元分析,对车站结构在施工过程中的应力变形变化进行模拟。并对其安全性进行了评估。
On the city planning of shanghai, underground large integrated buildings will be constructed on the basis of subway station pivot. Because such underground integrated building are built in the downtown district of the city, where miscellaneous structures exist, the construction has unfavorable effect on surrounding environment. Environment protection has become an important problem in geotechnical engineering design and construction in cities. And deformation is the key to its success. It is urgent to search such subject to protect adjacent proper usage and its safety. The chief works are summarized as follows:
    (1) On the basis of measurement data, the rule of soil deformation due to excavation is studied. Through FDM (finite difference method) numerical simulation, the displacement field of deep excavation adjacent underground building with large stiffness is researched, and compare with general excavation to gain some valuable conclusion.
    (2) On the basis of analyzing and concluding relative study product all over the world by the numbers, some general problem on the construction of underground integrated building is studied.
    (3) On the basis of transitive law of displacement resulting from deep excavation, partition of approach zone, formula of partition of approaching zone ,influence coefficient of the formula are put forward.
    (4) Through large number excavation engineering experience on the construction of subway in Shanghai, measured data and theoretical analysis, corresponding relation is established between environment protection grade and partition influence coefficient, to help for later similar engineering to part influence zone and to estimate influence degree.
    (5) The mechanical behavior of buildings and underground pipeline in the condition of different settlement is very important to determine the standard of deformation controlling and measures for the engineering protection. The contribution of additional inner forces of bearing walls is studied. The general approach to analyze the buildings damage under the given ground settlement and the way to evaluate the building safety are
     presented. The influence of ration L/H (length and height of the wall in settling area) of the bearing wall in influent region, and the ration E/G etc. are researched according to different settle mode. Stress model of underground pipeline due to differential settlement is analyzed. Evaluation indicators of operating station, such as rail deformation, structure deformation, structure inner force, are compared compressively, and then are analyzed, unified and defined, to get the unification among indicators. The allowable settlement criteria of the all kinds of buildings are summarized.
     (6) The above research results applied to practical engineering, 3D finite element method is used to simulate the whole process of construction of shanghai stadium underpassing station, and safety appraisal is made.
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