Quantitative analysis of influencing factors of subgrade service depth of civil airport runway
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摘要: 借助有限元数值分析方法求解了飞机荷载作用附加应力在民用机场场道土基分布的边值问题,在此基础上定量地研究了飞机荷载类型、刚性道面厚度、土基回弹模量以及工作区不同定义标准对工作区深度的影响：飞机荷载越重、起落架形式越复杂,土基中附加应力的影响范围越大,相应工作区深度越大;刚性道面的厚度越大,工作区深度越小;土基回弹模量越大,工作区深度越大;刚性道面的工作区深度与刚性道面厚度、土基回弹模量之间存在良好的线性关系,并且这种线性关系与工作区深度的定义标准有关。在上述分析的基础上,提出了一种确定刚性道面工作区深度的简易方法,可以规避繁琐的数值模拟。在场道的设计和建设工程中,可以借鉴本文研究成果确定机场场道路基的工作区深度进而选取合适的路基处理深度和处理方法。Abstract: The finite element numerical analysis method is adopted to solve the boundary value problem of additional stress distribution in subsoil of civil airport runway under aircraft load, and the effects of the aircraft load types, slab thickness of rigid pavement and subsoil resilient modulus on service depth are quantitatively analyzed. Heavier aircraft load and more complicated landing gear configuration lead to greater distributional zone and corresponding service depth. The service depth decreases with the increasing slab thickness of rigid pavement, but increases with the increasing subsoil resilient modulus. The relations between the service depth and the slab thickness of rigid pavement and the subsoil resilient modulus are both linear and depend upon the definition standard of the service depth. Based on the analysis, a simple method for determining the service depth of rigid pavement is proposed to avoid the complicated numerical analysis. The findings can be referenced for determining the service depth of airport runway, subsoil treatment depth and treatment method in the design and construction practice.
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Keywords:
- service depth /
- aircraft load /
- additional stress /
- slab thickness /
- subsoil resilient modulus /
- simple method
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