基于MIDAS-GTS基坑支护三维数值模拟分析

发布时间：2018-01-25 18:59

本文关键词： 深基坑工程桩锚支护体系有限元法 Midas-GTS　出处：《辽宁师范大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着经济和社会的不断提升，城市的建设迅猛发展，建筑用地紧缺，地下空间的开发与利用尤为重要，地下室及地下立体车库层数倍增，基坑的开挖深度也由原来几米增加到几十米，且由于周边邻建及地下地铁等大型地下工程的存在，基坑的支护更加困难，使得深基坑工程的支护方案设计和施工成为岩土工程领域的非常重要研究课题之一。本文以大连市深基坑工程为研究对象，针对大连铁路东站改造项目E区深基坑工程支护方案设计和施工存在的一些难点问题，通过引入有限元强度折减法对深基坑工程方案设计及施工进行了较为深入的研究，本文主要研究内容如下: (l)全面了解了大连市深基坑工程的支护体系的现状，指明了当前深基坑工程支护设计方面的漏洞及缺点，在该问题上，结合目前岩土工程的更新理论研究和实践成果、大连市基坑支护的发展状况和工程经验，以铁路东站深基坑为研究对象，对深基坑支护设计方案的合理性、施工的可行性及支护结构的安全性进行了深入的分析。 (2)通过理正深基坑支护结构设计软件对E区基坑进行支护设计计算，得到支护方案，，在基坑施工过程及建筑物基础施工阶段，依据相关规范要求，与实际监测数据对比分析，进一步验证方案的合理性和可行性。 (3)在理正软件基坑支护设计基础上，引入了有限元理论，基于岩土与隧道有限元分析软件MIDAS-GTS,结合深基坑工程的现场实际情况，建立了三维深基坑有限元分析模型，更直观的分析基坑的侧向位移、支护结构的应力应变及内力和周边建筑物的沉降情况。 (4)本文通过不同的研究方法，对E区基坑开挖后的土压力分析，设计基坑的支护方案，同时与实际监测数据对比分析，表明所建立的支护模型有较高的可靠性和实用性，为今后基坑工程的支护设计与施工提供技术支持。
[Abstract]:With the continuous improvement of economy and society, the rapid development of urban construction, the shortage of building land, the development and utilization of underground space is particularly important, the number of basement and underground three-dimensional garage is doubled. The excavation depth of foundation pit also increased from a few meters to tens of meters, and because of the surrounding adjacent construction and underground subway and other large-scale underground projects, it is more difficult to support foundation pit. It has become one of the most important research topics in the field of geotechnical engineering to design and construct the support scheme of deep foundation pit engineering. This paper takes Dalian deep foundation pit engineering as the research object, aiming at some difficult problems existing in the design and construction of the deep foundation pit engineering support scheme of Dalian East Railway Station reconstruction project E area. By introducing the finite element strength reduction method, the design and construction of deep foundation pit project are studied deeply. The main contents of this paper are as follows: The present situation of supporting system of deep foundation pit engineering in Dalian is fully understood, and the loopholes and shortcomings of supporting design of deep foundation pit engineering at present are pointed out. Combined with the current theoretical research and practical results of geotechnical engineering, the development and engineering experience of foundation pit support in Dalian City, taking the deep foundation pit of Railway East Station as the research object, the rationality of the deep foundation pit support design scheme. The feasibility of construction and the safety of supporting structure are deeply analyzed. (2) through the design software of supporting structure of deep foundation pit in Lizheng, the support design of E area foundation pit is calculated, and the supporting scheme is obtained. In the construction process of foundation pit and the construction stage of building foundation, according to the requirements of relevant codes. Compared with the actual monitoring data, the rationality and feasibility of the scheme are further verified. On the basis of the foundation pit support design of Lizheng software, the finite element theory is introduced, based on the finite element analysis software MIDAS-GTSof geotechnical and tunnel, combined with the field actual situation of deep foundation pit engineering. A three-dimensional finite element analysis model of deep foundation pit is established to analyze the lateral displacement of foundation pit, the stress and strain of supporting structure, the internal force and the settlement of surrounding buildings. 4) through different research methods, this paper analyzes the earth pressure after excavation of foundation pit in E area, designs the supporting scheme of foundation pit, and compares and analyzes with the actual monitoring data at the same time. The results show that the support model has high reliability and practicability, and provides technical support for the design and construction of foundation pit engineering in the future.
【学位授予单位】：辽宁师范大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU470

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