【摘要】：傳統瀝青路面結構力學模型通常將車輛荷載假定為圓形、橢圓形、矩形,與實際路面結構在非均布荷載作用下的真實受力狀態(tài)有一定的區(qū)別。應用3D-Move Analysis有限層軟件,建立黏彈性材料特性下力學響應模型,對比分析了靜載和動載情況下,不同荷載接觸形式對路面結構剪應力、路表彎沉、面層底部拉應力、土基頂部壓應變最大值及位置的影響;分析了水平力系數和軸載變化時,各指標最大值的變化規(guī)律。結果表明:不同荷載狀態(tài)、荷載接觸形式作用下,各力學指標最大值及位置有較大的區(qū)別;汽車勻速行駛時,按照傳統靜載計算結果進行力學指標設計是偏于安全的;汽車制啟動時,計算結果比靜載偏大,并隨著水平力系數的增加持續(xù)增大,仍按傳統靜載結果設計容易導致車轍、疲勞開裂等早期損壞現象;不同荷載接觸形式,各力學指標均隨軸載的增加而增大。
[Abstract]:The traditional mechanical model of asphalt pavement usually assumes that the vehicle load is circular, elliptical and rectangular, which is different from the real load state of the actual pavement structure under the action of non-uniform load. The mechanical response model of viscoelastic material under the characteristics of viscoelastic material is established by using 3D-Move Analysis finite layer software. The shear stress of pavement structure, the deflection of pavement surface and the tensile stress at the bottom of the pavement under different load contact forms under static load and dynamic load are compared and analyzed. The influence of the maximum value and position of the compressive strain on the top of the soil foundation; The variation law of the maximum value of each index is analyzed when the horizontal force coefficient and axial load change. The results show that the maximum value and position of each mechanical index are different under different load state and load contact form, and it is safe to design the mechanical index according to the traditional static load calculation results when the vehicle is driving at constant speed. The calculated results are larger than the static load when the automobile starts up, and with the increase of the horizontal force coefficient, it is still easy to cause rutting, fatigue cracking and other early damage phenomena according to the traditional static load design. Each mechanical index increases with the increase of axial load in different load contact forms.
【作者單位】： 湖南大學土木工程學院;
【基金】：國家自然科學基金資助項目(50808077,51278188)
【分類號】：U416.2
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本文編號：2308986