基坑工程的优化设计与分析

发布时间：2018-11-27 17:20

【摘要】：伴随着我国城镇化进程的快速推进,工民用建筑及基础设施工程中的地下空间开发已逐渐成为工程建设的重要组成部分,特别是深基坑工程发展异常迅速,基坑开挖深度越来越深、面积越来越大,对其技术的要求亦愈来愈高。因此,基坑工程设计特别是施工图阶段的优化设计工作更显得尤为重要。作为一门综合性土木工程学科分支,基坑支护结构设计不仅涉及岩土工程、结构工程及施工工艺等多方面内容,且由于岩土工程的复杂性、不确定性、地域差异性,不同的设计人员,对于同一工程可能会因各自规划设计理念不同而选择不同的支护形式,即使应用同种支护形式,设其计结果也可能不尽相同。本文通过基坑工程现状研究描述、变形规律分析、支护结构选型及应用软件介绍为基础,以优化设计为切入点,通过优化理论与实际工程的浅析研究,简述其在深基坑工程中的应用。结合工程实例的优化分析中,对于支护结构的内力计算与变形控制常是基坑优化设计的关键节点之二。许多基坑工程事故往往由于内力计算与变形控制取值不当,导致工程设计过于保守、造价浪费,加大建设投资；反之,则会造成设计失效、出现工程事故,引起更大的经济损失。本文引用大连市某已建基坑工程为实例,通过系统优化选型及计算优化分析,以成本工程造价为目标函数,展开优化设计研究工作,进行支护结构的弯矩、内力及桩顶水平位移分析,在深基坑工程系统优化设计与选定方案计算优化设计的基础上,最终选取较为适合的桩锚体系支护体系为本文的研究结果,从而使所研究基坑工程在安全、经济、适用的前提下,得出较为合理经济的优化分析结果。
[Abstract]:With the rapid development of urbanization in China, the development of underground space in civil and industrial buildings and infrastructure projects has gradually become an important part of engineering construction, especially the development of deep foundation pit engineering is extremely rapid. The excavation depth and area of foundation pit are getting deeper and larger, and the technical requirements are becoming higher and higher. Therefore, the optimization of foundation pit engineering design, especially in the construction drawing stage, is especially important. As a branch of comprehensive civil engineering, foundation pit support structure design not only involves geotechnical engineering, structural engineering and construction technology, but also because of the complexity, uncertainty and regional difference of geotechnical engineering. Different designers may choose different support forms for the same project because of their different planning and design concepts. Even if the same support form is applied, the calculation results may be different. Based on the research description of foundation pit engineering, the analysis of deformation law, the selection of supporting structure and the introduction of application software, this paper takes the optimization design as the breakthrough point, and analyzes and studies the optimization theory and practice engineering. Its application in deep foundation pit engineering is briefly described. In combination with the optimization analysis of engineering examples, the calculation of internal force and deformation control of supporting structure are often the key nodes in the optimization design of foundation pit. Many foundation pit engineering accidents are often due to improper calculation of internal force and deformation control, resulting in the engineering design is too conservative, cost waste, and increase construction investment; On the contrary, it will cause design failure, engineering accidents, causing greater economic losses. In this paper, an example of an existing foundation pit project in Dalian City is cited. Through system optimization selection and calculation and optimization analysis, taking cost engineering cost as objective function, the optimization design research work is carried out, and the bending moment of supporting structure is carried out. Based on the analysis of internal force and horizontal displacement of pile top, on the basis of the optimization design of deep foundation pit engineering system and the calculation and optimization design of selected scheme, the more suitable supporting system of pile and anchor system is selected as the research result of this paper. Therefore, under the premise of safety, economy and applicability, the optimum analysis results of the foundation pit works studied are more reasonable and economical.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU753

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