透水机坪道面结构可靠性研究

发布时间：2018-02-09 03:25

本文关键词： 衔接铺砌式透水道面力学联动效应变形协调效应浸水稳定性可靠性　出处：《中国民航大学》2014年硕士论文　论文类型：学位论文

【摘要】：地势平坦和开阔的机场停机坪为飞机安全滑行与可靠停放提供了良好的条件，传统的机坪道面都是几乎不透水的密实型结构，这种密实的道面结构在有效保证其强度和刚度的同时，其不透水性也带来了暴雨时段易形成积水而影响机场运行的问题，以及远机位飞机旅客涉水登机的问题。此外，大量的雨水被排放到场外，直接造成场区地表土壤水分不足而形成局部热岛效应。因此，需要提高道面渗水性能来克服这些问题，以获得改善机场运行环境和节能减排的良好效果。本课题以透水性道面结构的可靠性为研究目标，以衔接铺砌式透水道面结构体系为研究对象，基于理论分析、有限元数值分析和工程实体实验结果，研究不同土基与基层结构对该透水性道面结构稳定性的影响规律。研究工作包括对不同砂土地基和碎石基层形式和含水状态下的支承能力进行了系列模拟分析和实验研究，分别针对3种不同平面尺寸、3种宽厚比、3种不同的加载位置、2种工况下的54种实验组合方式进行了分析研究，基于衔接铺砌式透水道面的力学联动效应和变形协调效应下的浸水稳定性能分析，确定了不同组合透水板块下的极限荷载、临界荷位、临界变形和最优宽厚比。有限元数值分析和工程实体实验研究的结果表明：使用砂土作为土基材料时，含砂率存在一个临界值70%，大于该值时砂土具有较好的饱水稳定性能，承载能力损失程度较小；优化后的碎石级配区间为4.75-31.5mm，该区间骨料具有较高的强度和较好的渗透性能，，可以有效地提高道面结构整体的承载能力；角部加载是衔接铺砌式透水道面结构最不利的加载位置，建议以角部作为铺砌式透水道面设计的临界荷位；平面尺寸为200mm、330mm和500mm的透水板块均在宽厚比为4时，浸水后极限荷载和临界变形的损失程度最小，具有较好的浸水可靠性和稳定性；330-4组合的透水板块道面结构在饱水状态下可以承受B737系列机型使用荷载停放要求。这些结论为新型衔接铺砌式透水道面结构在机坪结构的设计与应用提供了可靠的优化参数和理论依据。
[Abstract]:The flat and open airport tarmac provides good conditions for the plane to glide safely and to park reliably. The traditional apron pavement is almost watertight and dense. While this dense pavement structure effectively guarantees its strength and stiffness, its impermeability also brings problems such as the formation of stagnant water during heavy rain and the problems affecting the operation of the airport, as well as the problem of wading through the water and boarding the aircraft from afar. A large number of Rain Water has been discharged out of the field, which directly results in a local heat island effect due to the lack of soil water in the field area. Therefore, it is necessary to improve the seepage performance of the pavement to overcome these problems. In order to improve the airport operating environment and energy saving and emission reduction good results. In this paper, the reliability of the permeable pavement structure is taken as the research goal, and the structure system of the connected paving permeable pavement is taken as the research object, based on the theoretical analysis, finite element numerical analysis and the experimental results of engineering entities. The influence of different soil foundation and base structure on the stability of the permeable pavement is studied. The research work includes a series of simulation analysis and experimental study on the bearing capacity of different sand foundation and gravel base under the condition of water content. In this paper, 54 experimental combinations of three different plane sizes, three width-thickness ratios, three different loading positions and two working conditions are analyzed and studied. Based on the analysis of the stability of immersion under the mechanical linkage effect and deformation coordination effect, the ultimate load, critical load, critical deformation and optimum width-thickness ratio under different combinations of permeable plates are determined. The results of finite element numerical analysis and engineering experiment show that when sand is used as soil foundation material, the sand content has a critical value of 70. When the sand content is larger than this value, the sand has better saturated and stable performance, and the loss of bearing capacity is small. The optimized gradation interval of crushed stone is 4.75-31.5mm. The aggregate of the section has higher strength and better permeability, which can effectively improve the bearing capacity of the whole pavement structure, and the corner loading is the most unfavorable loading position for the connected paving permeable pavement structure. It is suggested that the angle should be taken as the critical load position for the design of the pavement surface, and the plate with the plane size of 200mm / 330mm and 500mm is at 4:00 width to thickness ratio, and the ultimate load and critical deformation after immersion are the least. The permeable plate pavement structure with better flooding reliability and stability can withstand the load parking requirements of B737 series model under saturated condition. These conclusions are the new type of connecting paving type permeable pavement structure in the machine. The design and application of flat structure provide reliable optimization parameters and theoretical basis.
【学位授予单位】：中国民航大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.2

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