深基坑桩锚支护结构的设计与应用

发布时间：2019-03-27 14:04

【摘要】：摘要：深基坑支护设计是当前高层建筑设计施工中存在的难题,设计方案是否科学合理,直接关系到工程的质量、进度、经济效益和安全。它也是个复杂的综合性岩土工程问题,涉及到工程周边环境、场地地层特性和岩土力学参数,同时还有土与支护结构之间的共同作用。论文对各种基坑支护结构设计应遵守的原则,承载能力极限状态和正常使用状态下必须满足的各种条件进行了探讨；同时结合实例对设计数据进行相应的验算,包括基坑稳定性、周边环境及支护结构变形、抗渗透稳定性、抗隆起及基坑底突涌稳定性验算等。桩锚支护设计主要的方法有常规设计法、弹性抗力法以及数值分析方法等。本文对这些方法的理论基础进行了探讨,对各种方法存在的问题进行了分析；并结合基坑工程实例和相关规范,采用前两种方法探讨了桩锚设计的设计方法和计算过程。 (1)探讨了深基坑土压力的七种理论,并对桩锚支护设计体系中的土压力计算进行了详细的推导。 (2)对深基坑桩锚支护结构选型及结构体系进行了研究,包括支护结构水平荷载与水平抗力的计算、悬臂式支护结构计算、多支点支护结构计算、结构内力及截面承载力计算和锚杆计算等。 (3)通过详细论述这种支护体系的工作机理并进行力学分析阐明该支护结构的力学特性和优点。 (4)采用经典法进行结构内力、变形及支点力设计计算,并根据规范要求进行相应的稳定性验算。 (5)结合某深基坑支护工程实例,设计采用桩锚支护结构,布置合理的工程排水系统和监测系统,实际结果证明,这些措施的实施保证了基坑支护工程施工的顺利进行。 (6)通过从理论研究到工程实例设计,总结了桩锚支护的优缺点,明确了该支护方法的适用条件,对同类工程支护方法的选择和设计在经验和技术上具有一定的指导作用。图21幅,表6个,参考文献67篇
[Abstract]:Abstract: the supporting design of deep foundation pit is a difficult problem existing in the design and construction of high-rise building at present, whether the design scheme is scientific or not is directly related to the quality, progress, economic benefit and safety of the project. It is also a complex and comprehensive geotechnical engineering problem, which involves the surrounding environment of the project, ground characteristics and geotechnical mechanical parameters, as well as the interaction between soil and supporting structure. In this paper, the principles that should be obeyed in the design of various foundation pit supporting structures, the limit state of bearing capacity and the various conditions which must be satisfied under normal service condition are discussed. At the same time, the design data are checked with examples, including the stability of foundation pit, the deformation of surrounding environment and supporting structure, the stability of anti-seepage, the stability of anti-uplift and the stability of bottom inrush of foundation pit, and so on. The main methods of pile-anchor support design include conventional design method, elastic resistance method and numerical analysis method. In this paper, the theoretical basis of these methods is discussed, the existing problems of various methods are analyzed, and the design method and calculation process of pile-anchor design are discussed by using the first two methods, combined with the examples of foundation pit engineering and relevant codes. The main results are as follows: (1) the seven theories of earth pressure in deep foundation pit are discussed, and the calculation of soil pressure in the design system of pile-anchor support is deduced in detail. (2) the selection of pile-anchor supporting structure and structure system of deep foundation pit are studied, including the calculation of horizontal load and horizontal resistance of supporting structure, the calculation of cantilever support structure, the calculation of multi-support structure, and the calculation of pile-anchor supporting structure of deep foundation pit. The calculation of internal force and cross-section bearing capacity of the structure and the calculation of anchor rod etc. (3) the working mechanism of this support system is discussed in detail, and the mechanical characteristics and advantages of the supporting structure are explained by mechanical analysis. (4) the design and calculation of internal force, deformation and fulcrum force of the structure are carried out by classical method, and the corresponding stability calculation is carried out according to the requirements of the code. (5) combined with an example of a deep foundation pit supporting project, the pile-anchor supporting structure is designed and a reasonable drainage system and monitoring system are arranged. The practical results show that the implementation of these measures ensures the smooth construction of the foundation pit supporting project. (6) through the theoretical research to the design of engineering examples, the advantages and disadvantages of pile-anchor support are summarized, and the applicable conditions of the supporting method are defined, which can guide the selection and design of similar engineering support methods in experience and technology to a certain extent. 21 figures, 6 tables, 67 references
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU473.2

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