西安某建筑深基坑工程绿色支护方案评价及优化

发布时间：2018-04-27 14:51

本文选题：基坑支护 + 方案优化　；参考：《西安工业大学》2017年硕士论文

【摘要】：在工程建设中,基坑支护因其功能的重要性和设计的复杂性一直是广大学者们研究的对象,在基坑支护的设计、施工和监测过程中需要结合岩土和结构等专业知识来进行分析和研究,以在实现安全适用的同时从环保角度出发,探讨如何提高基坑支护的施工效率、降低材料损耗及最大限度地消除对场地的污染和对环境的干扰。即,如何获得满足可持续发展需要的绿色支护方案是具有研究价值的课题。本文阐述了绿色支护方案的设计理论,并在工程常见的基坑支护方案中,列举并对比了多种支护型式的特点和适用性,指出了预应力混凝土管桩作为基坑支护材料的优点。基于多层次灰色评价决策体系建立了基坑支护方案的优选模型,列出了基本的计算流程和步骤,并给出了计算各指标权重的方法。通过西安某建筑深基坑的工程实例,从地层特征和场地条件出发,将基坑支护材料的力学性能、施工周期、工程造价和场地环境等综合因素作为设计要求,计算了材料所需的性能和成本,结合工程实际需要,进而选定灌注桩、PHC管桩和PRC管桩做进一步对比。以多层次灰色评价模型为依据,从数值分析角度给出了最优解,即PRC管桩在本工程中为最优的绿色支护方案。最后,对该深基坑的最优支护方案进行优化,在荷载较大处采用承载力较大的PRC桩型,在荷载较小处采用承载力较小的PHC桩型。本文将多层次灰色评价决策体系应用于基坑支护方案的选择,基于规范和相关文献构建了评价指标体系,建立了多层次灰色评价模型。该方法可从多个角度综合评价方案的优劣,尤其适用于研究如基坑支护这种多因素共存且相互影响的对象。经过分析,PRC管桩作为基坑支护材料,能够在安全适用的基础上,满足高效、节能的要求,是具有工程应用价值的,PRC管桩支护方案是适于推广的基坑绿色支护方案。目前,使用预制桩作为基坑支护桩在西安市尚不多见,大多数工程项目是凭经验选用灌注桩+预应力锚索作为基坑支护方案。本文从基坑支护的原理出发,对比预制桩+预应力锚索方案和灌注桩+预应力锚索方案,从理论计算、现场施工的适宜性、施工的便捷性及周期、工程造价等方面进行分析,旨在从绿色支护方案的理念出发,探索更适合本工程的绿色的基坑支护方案。本文的研究成果可作为西安市及其他地区基坑支护方案选型的参考,具有一定的意义。
[Abstract]:In the construction of engineering, the importance and complexity of the foundation pit support have always been the research object of the vast majority of scholars. In the process of design, construction and monitoring of foundation pit support, it is necessary to combine the specialized knowledge of rock and soil and structure to analyze and study it in order to realize the application of safety and environmental protection. Improving the construction efficiency of the foundation pit support, reducing the material loss and eliminating the pollution to the environment and the disturbance to the environment. That is, how to obtain the green support scheme to meet the needs of sustainable development is a subject of research value. This paper expounds the design theory of the green support scheme and the common foundation pit supporting scheme in the project. The characteristics and applicability of various types of support are enumerated and compared. The advantages of prestressed concrete pipe pile as foundation pit support material are pointed out. Based on the multi-level grey evaluation decision system, the optimization model of foundation pit support scheme is set up, the basic calculation process and steps are listed, and the methods for calculating the weight of each index are given. After the engineering example of a deep foundation pit in Xi'an, starting from the formation characteristics and site conditions, the mechanical properties of the foundation pit supporting materials, the construction period, the construction cost and the site environment are used as the design requirements. The required performance and cost of the material are calculated, and the cast-in-place pile, PHC pipe pile and PRC pipe pile are selected in combination with the actual needs of the project. On the basis of the multi-level grey evaluation model, the optimal solution is given from the angle of numerical analysis, that is, the optimal green support scheme for PRC pipe pile in this project. Finally, the optimal support scheme for the deep foundation pit is optimized, and the PRC pile with larger bearing capacity is adopted in the larger load, and the bearing capacity is adopted at the smaller load. The multi-layer grey evaluation decision system is applied to the selection of the foundation pit support scheme, and the evaluation index system is constructed based on the standard and related literature, and a multi-level grey evaluation model is established. This method can be used to evaluate the advantages and disadvantages of the scheme from many angles, especially in the study of the multi factors such as foundation pit support. After analysis, PRC pipe pile, as a foundation pit supporting material, can meet the requirements of high efficiency and energy saving on the basis of safety and application. It is of engineering application value. PRC pipe pile supporting scheme is a green supporting scheme suitable for popularization of foundation pit. At present, it is not much to use prefabricated pile as foundation pit supporting pile in Xi'an According to the principle of foundation pit support, this paper contrasts the precast pile + prestressed anchor cable scheme and the cast-in-place pile + prestressed anchor cable scheme, from the theoretical calculation, the site construction suitability, the construction convenience and the period, the project cost and so on. The purpose of this paper is to explore a green foundation pit supporting scheme which is more suitable for this project. The research results of this paper can be used as a reference for the selection of foundation pit support schemes in Xi'an and other areas, and it has certain significance.

【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753

【参考文献】