【摘要】：荷載作用下路面各結(jié)構(gòu)層的力學(xué)行為不同,粒狀類材料(碎石等)及土質(zhì)材料對力的作用有很大的敏感性,方向依賴性比較強,采用橫觀各向同性的彈性模型來預(yù)測粒狀類基層和土基,并用行駛車輛的瞬態(tài)動載荷代替?zhèn)鹘y(tǒng)的靜載,能更好地預(yù)測路面結(jié)構(gòu)的使用性能,對長壽命路面結(jié)構(gòu)設(shè)計的進一步研究具有非常重要的意義。 本文首先建立了橫觀各向同性路基在FWD脈沖荷載作用下的三維有限元模型,利用有限元動力學(xué)的基本原理對FWD荷載作用下土基表面距載荷中心點不同距離各傳感器點的彎沉與荷載中心不同深度處的應(yīng)力,以及路基材料的各向異性對其的影響進行了分析評價。采用動載比靜載更符合實際,預(yù)測結(jié)果更接近于路基路面的實際響應(yīng)狀況,能為路基路面工程結(jié)構(gòu)的施工和進一步研究提供依據(jù)。 其次,考慮碎石基層的各向異性特性,其他層為各向同性彈性體,建立橫觀各向同性碎石基層瀝青路面結(jié)構(gòu)在移動荷載作用下的三維有限元三層彈性體系模型,研究了瀝青路面各結(jié)構(gòu)層的動力響應(yīng)分析。 最后,考慮土基的各向異性特征,對其他層考慮各向同性彈性特征,討論動荷載運行至路面模型中央時,土基的橫觀各向同性以及不同類型、大小的瞬態(tài)荷載對軸載中心點處路面表面彎沉、級配碎石基層底部拉應(yīng)力和土基頂部壓應(yīng)力的影響,為超載的控制和路面使用壽命的延長有很好的指導(dǎo)作用。
[Abstract]:The mechanical behavior of each structure layer is different under load. Granular materials (gravel, etc.) and soil materials have a great sensitivity to the force, and the direction dependence is relatively strong. The transversely isotropic elastic model is used to predict the granular base and soil foundation, and the transient dynamic load of moving vehicle is used to replace the traditional static load, which can better predict the performance of pavement structure. It is of great significance to further study the design of long-life pavement structure. In this paper, a three-dimensional finite element model of transversely isotropic subgrade under FWD pulse load is established. By using the basic principle of finite element dynamics, the deflection of the soil foundation surface at different distances from the center of the load and the stresses at different depths of the load center under FWD loading are investigated. The influence of anisotropy of subgrade material on it is analyzed and evaluated. The dynamic load is more in line with the reality than the static load, and the predicted results are closer to the actual response of the subgrade and pavement, which can provide the basis for the construction and further study of the subgrade and pavement engineering structure. Secondly, considering the anisotropy of crushed stone base, the other layers are isotropic elastomer, and the three-dimensional finite element three-layer elastic system model of asphalt pavement structure with transversely isotropic gravel base under moving load is established. The dynamic response analysis of each structure layer of asphalt pavement is studied. Finally, considering the anisotropic characteristics of soil foundation and the isotropic elastic characteristics of other layers, the transversely isotropic and different types of soil foundation are discussed when the dynamic load is running to the center of the pavement model. The influence of transient load on the surface deflection of the pavement at the center of axial load, the tensile stress at the base of graded crushed stone and the compressive stress at the top of the soil foundation has a good guiding effect on the control of overload and the prolongation of pavement service life.
【學(xué)位授予單位】：太原科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：U416.217

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