宁波地铁翠柏里站基坑开挖模拟及变形分析

发布时间：2018-01-05 09:40

本文关键词：宁波地铁翠柏里站基坑开挖模拟及变形分析　出处：《安徽理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着我国城市化进程的加速推进,城市地下空间的开发和利用已经成为了当下城市建设的一个热点,这也使得在城市建设过程中越来越多地涉及到深基坑工程。在沿海地区,复杂条件下基坑稳定性的预测评估变得尤为重要。宁波地铁四号线翠柏里站基坑深16.2m,长约200m,且处于沿海淤泥质地层,工程施工难度大。本文以此为研究工程背景,通过对多种土体本构模型的分析,选用了适应于该种地质条件的小应变硬化土模型(HSS),并结合相关参数取值经验,选用了合适的模型参数,在基坑开挖前使用Plaxis岩土工程有限元软件对基坑的开挖过程进行了建模分析,得到了多种支护方案下基坑的应力变形特性,评估了基坑的稳定性。同时还使用GE05岩土工程设计软件对该基坑基于弹性支点法进行计算分析,并与前述结果相比较。最后,通过对基坑深层水平位移的现场实测,得到了实际变形数据,并与有限元模拟结果进行对比,分析了误差存在的原因,为后续研究和相似基坑工程的设计提供了经验。
[Abstract]:With the acceleration of urbanization in China, the development and utilization of urban underground space has become a hot spot of urban construction. This also makes the process of urban construction more and more involved in deep foundation pit engineering. In coastal areas. It is very important to predict and evaluate the stability of foundation pit under complex conditions. The foundation pit depth of Cui Baili Station of Ningbo Metro Line 4 is 16.2 m, which is about 200 m long, and it is located in the silt layer along the coast. Based on the analysis of various constitutive models of soil mass, a small strain hardening soil model suitable for this kind of geological condition is selected. Combined with the experience of selecting the relevant parameters, the appropriate model parameters are selected, and the excavation process of the foundation pit is modeled and analyzed by using the Plaxis geotechnical engineering finite element software before the excavation of the foundation pit. The stress and deformation characteristics of foundation pit under various support schemes are obtained, and the stability of foundation pit is evaluated. At the same time, GE05 geotechnical engineering design software is used to calculate and analyze the foundation pit based on elastic fulcrum method. Finally, through the field measurement of deep horizontal displacement of foundation pit, the actual deformation data are obtained, and compared with the results of finite element simulation, the reason of the error is analyzed. It provides experience for further study and design of similar foundation pit engineering.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753

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