郑州会展宾馆深基坑支护监测及风险应对措施分析

发布时间：2018-01-28 04:15

本文关键词： 支护方案风险分析数值模拟基坑监测　出处：《河南工业大学》2010年硕士论文　论文类型：学位论文

【摘要】： 基坑工程开挖过程中,对支护结构的变形分析和基坑支护方案风险因素分析十分重要,这不仅关系到基坑的安全施工,也对促进我国基坑工程领域的技术发展意义重大。本论文的选题来源于郑州会展宾馆基坑工程。建成后的郑州会展宾馆将达到280米,是河南省内最高的建筑物,该基坑也是我国中部地区极具代表性的工程项目,具有规模大、开挖深及周边施工环境复杂的特点,对该基坑支护结构进行变形分析研究很有必要。在完成了理论知识的储备,查阅了大量文献资料的基础上,结合工程项目实际,主要将开展以下工作: 基坑在设计初期拟采用两种方案,一种是桩锚支护方案,另一种是桩撑支护方案。论文分别从工期、变形计算和造价等方面对两种方案进行比选,最终得出最佳方案,和专家联合论证的方案进行对比,并就所选方案中存在的风险因素进行分析。基坑环境风险不仅包括基坑周围环境所带来的不确定因素,也包括基坑支护方案自身所隐含的风险因素。论文利用岩土工程数值模拟软件FLAC3D对基坑所面临的环境风险进行了模拟预测,主要对各个工况下的地表沉降、护坡桩桩体的深层水平位移及支撑轴力进行计算模拟,并对模拟结果进行分析。通过对监测数据的整理,从基坑支护结构中内支撑的轴力、支护桩顶水平位移和支护结构深层水平位移三个角度对基坑桩撑支护方案进行分析,找出数据反映的规律和趋势,并与数值模拟结果进行对比,针对相关问题进行分析论述。针对基坑支护方案在基坑变形、降水设计和支护结构变形等方面存在的风险因素提出相应的应对措施。当不确定因素对基坑安全造成事实性危害时,提出相应的风险处置措施。论文系统研究了基坑工程支护方案的风险因素,从数值模拟和现场监测两个方面分析了风险因素对基坑工程的影响,对促进我国基坑工程施工技术和风险管理发展提供一点借鉴。
[Abstract]:In the excavation process of foundation pit, it is very important to analyze the deformation of supporting structure and the risk factors of foundation pit support scheme, which is not only related to the safe construction of foundation pit. It is also of great significance to promote the technical development of foundation pit engineering in China. The topic of this paper comes from the foundation pit project of Zhengzhou Convention and Exhibition Hotel. After the completion of the project, the Zhengzhou Exhibition Hotel will reach 280 meters. It is the tallest building in Henan Province. The foundation pit is also a representative project in the central part of China. It has the characteristics of large scale, deep excavation and complex surrounding construction environment. It is necessary to analyze the deformation of the foundation pit supporting structure. On the basis of completing the reserve of theoretical knowledge, consulting a lot of literature and combining with the actual engineering project, the following work will be carried out: In the early design of foundation pit, two schemes are proposed, one is pile-anchor support scheme, the other is pile-braced support scheme. This paper compares the two schemes from the aspects of time limit, deformation calculation and cost. Finally, the best scheme is obtained, compared with the scheme jointly demonstrated by experts, and the risk factors in the selected scheme are analyzed. The environmental risk of foundation pit not only includes the uncertain factors brought about by the surrounding environment of foundation pit. It also includes the risk factors implied by the foundation pit support scheme. The paper uses the geotechnical engineering numerical simulation software FLAC3D to simulate and predict the environmental risk faced by the foundation pit. The surface settlement, deep horizontal displacement and supporting axial force of slope protection pile are calculated and simulated, and the simulation results are analyzed. Through the collation of the monitoring data, this paper analyzes the supporting scheme of foundation pit from three angles: the axial force of the internal support, the horizontal displacement of the supporting pile top and the deep horizontal displacement of the supporting structure. Find out the law and trend of data reflection, and compare with the numerical simulation results, and analyze and discuss the related problems. Aiming at the risk factors of foundation pit deformation, dewatering design and supporting structure deformation, the corresponding countermeasures are put forward, when uncertain factors cause factual harm to foundation pit safety. Put forward the corresponding risk disposal measures. The paper systematically studies the risk factors of foundation pit engineering support scheme, and analyzes the influence of risk factors on foundation pit engineering from two aspects of numerical simulation and field monitoring. It can be used for reference to promote the construction technology and risk management development of foundation pit engineering in China.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：TU753

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