差异沉降下机场刚性道面的结构响应与容许沉降分析

Research on Mechanical Responses and Allowable Settlement of Airport Rigid Pavement under Differential Settlement

目前对跑道横向差异沉降的研究较少,且其沉降控制标准尚无定论。为此,文中依托西南某机场,针对不同跑道宽度及不同沉降幅值的余弦式差异沉降,采用数值模拟的方法,研究横向差异沉降下道面结构响应特征,提出横向差异沉降容许值。研究表明:道面结构响应受跑道宽度和沉降幅值的综合影响,沉降幅值越大,道面各层的变形量及板底拉应力也越大,且出现层间分离现象;跑道宽度越大,道面各层的沉降跟随性越好;对于3C、4E、4F等级跑道,横向差异沉降率应分别控制为0.26%,0.14%,0.1%。

There are few studies on the lateral differential settlement of runway and its settlement control standard is inconclusive.Therefore,based on an airport in Southwest China,in view of different runway width and cosine differential settlement of different settlement amplitudes,the response characteristics of pavement structure under transverse differential settlement were studied by numerical simulation method,and the allowable value of transverse differential settlement was proposed.Results indicate that the response of pavement structure is affected by runway width and settlement amplitude.As the settlement amplitude increases,the deformation of each layer and the tensile stress of the cement slab also increase,and the separation between the layers occurs.When the runway width increases,the settlement following performance of each layer is better.For runways of grades 3C,4E and 4F,the transverse differential settlement rate should be controlled to 0.26%,0.14%,0.1%.