深基坑施工对周围环境的影响分析

发布时间：2018-08-07 16:23

【摘要】：当今城市规模不断发展扩大，大规模的基坑工程施工不仅为研究发展基坑技术带来机遇，更使研究和技术人员面对许多挑战和提出了很多难题。其中最重要的一个课题就是深基坑开挖对周围环境的影响问题。本文以天津六纬路基坑工程施工为背景，利用ANSYS建立大型三维有限元模型，通过数值模拟软件GDEM模拟施工现场降水前后不同工况下对基坑自身及周围环境的影响，分析基坑工程开挖和支护过程中对围护结构及周围地铁隧道、建筑物及道路沉降变形的影响。并和现场监测数据作对比，验证所使用方法的可行性。利用基于连续介质力学的离散单元法软件GDEM，模拟基坑工程不同的开挖方式、围护结构入土深度及支撑刚度对自身围护结构变形、位移以及周围环境的影响。得到了不同开挖支护方式下基坑围护结构、周边建（构）筑物及道路沉降曲线，总结出基坑工程施工过程中对周围环境影响的主要因素为开挖卸荷导致的基底回弹隆起、地下水位的降低和围护结构的变形，并与实测数据对比，优化了施工方案。通过参照实际工程建立大型三维有限元模型，对主要影响基坑自身稳定及周围环境影响的因素进行分析，，提高了人们对于大型复杂结构的认识，并希望可以为以后类似结构设计和建造提供参考依据。
[Abstract]:Nowadays, the scale of urban development is expanding. The large-scale foundation pit construction not only brings opportunities to the research and development of foundation pit technology, but also makes research and technical personnel face many challenges and many difficult problems. One of the most important issues is the influence of deep foundation pit excavation on the surrounding environment.
In this paper, based on the construction of the foundation pit of the six weft road in Tianjin, a large three-dimensional finite element model is established by using ANSYS. Through the numerical simulation software GDEM, the influence of the foundation pit itself and the surrounding environment under the different working conditions of the construction site precipitation is simulated, and the structure of the enclosure and the surrounding subway tunnel in the process of excavation and support are analyzed. And the influence of road settlement and deformation is compared with field monitoring data to verify the feasibility of the method.
The discrete element method software GDEM based on continuous medium mechanics is used to simulate the different excavation methods of the foundation pit, the depth of the retaining structure and the influence of the support stiffness on the deformation, displacement and surrounding environment of the retaining structure, and the surrounding construction, the surrounding construction and the settlement curve of the road are obtained. The main factors affecting the surrounding environment in the construction process of foundation pit engineering are the basement rebound uplift caused by excavation unloading, the reduction of groundwater level and the deformation of the enclosure structure, and the construction scheme is optimized by comparing with the measured data.
By establishing a large three-dimensional finite element model with reference to practical engineering, the factors that mainly affect the stability of the foundation pit and the influence of the surrounding environment are analyzed, and people's understanding of the large complex structure is improved, and it is hoped that it can provide reference basis for the design and construction of similar structures in the future.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU753;TU433

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