h型抗滑桩计算分析及工程应用

发布时间：2019-07-06 10:19

【摘要】：h型抗滑桩是一种特殊的抗滑支挡结构,由长桩、短桩、横梁、承载板与挡土板组成的,兼有承重、阻滑和支挡三种功能。h型抗滑桩的悬臂段主要承受填料荷载作用,悬臂段以下结构部分主要承受边坡上滑坡推力作用。通过横梁与承载板对上部荷载的抵抗,横梁以下的长桩桩后水平推力大幅降低,并且横梁以上的填料的变形可以较好的人为控制。横梁上填土的存在使该结构的重心后移,提高了体系的整体稳定性。因此,h型抗滑桩在受力和沉降控制方面都是较佳的形式。h型抗滑桩受力同其他支挡结构相比差别明显,桩土相互作用较为复杂,在进行结构设计时许多参数是依据经验来选取,难以满足工程设计要求。论文首先通过分析h型抗滑桩的工作机理及荷载情况,确定了h型抗滑桩的土压力荷载计算方法及结构计算模型,给出了结构内力计算方法,并得到h型抗滑桩的结构设计流程及配筋设计方法；然后对h型抗滑桩进行了数值分析,对典型h型桩结构进行了三维数值分析,主要分析了填料与列车荷载对承载板和挡土板的作用大小与分布、桩-土体相互作用大小与分布、内力大小与分布情况以及结构变形特征。通过建立不同的三维或平面数值模型,对填料厚度、覆土厚度、横向桩间距和纵向桩间距四个参数对h型抗滑桩的影响进行了敏感性分析,主要分析了参数变化对结构内力变形的影响；最后,对实际工点的h型抗滑桩进行结构计算及配筋设计,并对该工点的h型抗滑桩进行结构内力、结构变形和土压力分布的现场监测,最后对现场监测结果进行分析并和设计计算进行对比分析。综上,论文通过理论计算分析,并结合数值分析和现场监测,对h型抗滑桩的结构-土体相互作用的计算方法及结构的设计计算方法进行验证分析,指导实际h型抗滑桩的工程应用。
[Abstract]:H-type anti-slide pile is a special anti-slide retaining structure, which is composed of long pile, short pile, crossbeam, bearing plate and retaining plate. The cantilever section of H-type anti-slide pile is mainly subjected to packing load, and the lower part of cantilever section is mainly subjected to landslide thrust on slope. Through the resistance of the beam and the bearing plate to the upper load, the horizontal thrust of the long pile below the beam is greatly reduced, and the deformation of the packing above the beam can be controlled artificially. The existence of filling on the beam makes the center of gravity of the structure move backward and improves the overall stability of the system. Therefore, h-type anti-slide pile is a better form in stress and settlement control. Compared with other retaining structures, the force of H-type anti-slide pile is obviously different from that of other retaining structures, and the pile-soil interaction is more complex. Many parameters are selected according to experience in structural design, which is difficult to meet the requirements of engineering design. Firstly, by analyzing the working mechanism and load of h-type anti-slide pile, the earth pressure load calculation method and structural calculation model of h-type anti-slide pile are determined, the calculation method of structural internal force is given, and the structural design flow and reinforcement design method of h-type anti-slide pile are obtained. Then, the numerical analysis of h-type anti-slide pile is carried out, and the three-dimensional numerical analysis of typical h-pile structure is carried out. the effect and distribution of packing and train load on bearing plate and retaining plate, the size and distribution of pile-soil interaction, the size and distribution of internal force and the deformation characteristics of structure are mainly analyzed. Through the establishment of different three-dimensional or plane numerical models, the influence of filling thickness, overlying soil thickness, transverse pile spacing and longitudinal pile spacing on h-type anti-slide pile is analyzed sensitively, and the influence of parameter change on internal force and deformation of the structure is mainly analyzed. Finally, the structural calculation and reinforcement design of h-type anti-slide pile are carried out, and the internal force, structural deformation and earth pressure distribution of h-type anti-slide pile are monitored on the spot. Finally, the field monitoring results are analyzed and compared with the design calculation. In summary, through theoretical calculation and analysis, combined with numerical analysis and field monitoring, the calculation method of structure-soil interaction and the design and calculation method of H-type anti-slide pile are verified and analyzed, which guides the practical engineering application of h-type anti-slide pile.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU473.1

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