【摘要】：文章采用廣義Maxwell模型描述瀝青混合料面層的黏彈性,考慮碎石基層和土基的橫觀各向同性特征對路面結(jié)構(gòu)力學(xué)行為的影響。在彈性假設(shè)條件下引入材料水平模量與豎直模量比值為變量,運(yùn)用有限元方法建立路面結(jié)構(gòu)三維有限元模型;通過模擬計算,對比分析均布荷載作用下碎石基層和土基各向同性與橫觀各向同性對各結(jié)構(gòu)層應(yīng)力和應(yīng)變及路表彎沉值的影響,并對瀝青路面服務(wù)壽命進(jìn)行預(yù)估分析。分析結(jié)果表明:均布荷載作用下碎石基層的橫觀各向同性特征對路表彎沉影響較小,而土基橫觀各向同性特征對路表彎沉影響較大;路基頂部壓應(yīng)變受碎石基層及土基橫觀各向同性特征影響較大,而面層層底拉應(yīng)變和基層底拉應(yīng)力僅受碎石基層橫觀各向同性特征影響較大;瀝青路面服務(wù)壽命受碎石基層橫觀各向同性特征影響較大,且在碎石基層各向同性時服務(wù)壽命最長。因此,在路面結(jié)構(gòu)設(shè)計中應(yīng)適當(dāng)考慮基層和路基材料的橫觀各向同性特征。
[Abstract]:In this paper, the viscoelasticity of asphalt mixture surface is described by generalized Maxwell model, and the influence of transversely isotropic characteristics of macadam base and soil foundation on the mechanical behavior of pavement structure is considered. Under the condition of elastic assumption, the ratio of horizontal modulus to vertical modulus of material is introduced as variable, and the three-dimensional finite element model of pavement structure is established by finite element method. The effects of isotropic and transversely isotropic macadam base and soil foundation on the stress and strain of each structure layer and the deflection value of pavement surface under uniform load are analyzed and the service life of asphalt pavement is estimated. The results show that the transversely isotropic characteristics of crushed stone base have little effect on the road surface deflection, while the soil foundation transversely isotropic feature has a great influence on the road surface deflection. The compressive strain at the top of the roadbed is greatly affected by the transversely isotropic characteristics of the gravel base and the soil foundation, while the tensile strain and the tensile stress of the bottom layer are only affected by the transversely isotropic feature of the gravel base. The service life of asphalt pavement is greatly affected by the transversely isotropic characteristics of gravel base, and the service life is the longest when the gravel base is isotropic. Therefore, the transversely isotropic characteristics of base course and subgrade material should be taken into account in pavement structure design.
【作者單位】： 湖南大學(xué)土木工程學(xué)院;鄭州市政工程勘測設(shè)計研究院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(50808077;51278188)
【分類號】：U416.217

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