路面结构对填砂路基不均匀沉降变形的力学响应

Mechanical Response of Pavement Structure on Uneven Settlement Deformation of Sand-filled Subgrade

针对填砂路基产生不均匀沉降对路面结构产生破环的情况,建立起能反映填砂路堤不均匀沉降对沥青路面结构影响的有限元分析模型,通过计算分析不均匀沉降量对沥青路面结构的影响,研究不同路面结构层次组合对填砂路堤不均匀沉降的适应性。根据研究成果提出,实际工程应采取有效措施控制填砂路堤的不均匀沉降,从而延长路面使用寿命;在保证路表弯沉、道路承载能力的前提下,可适当选用模量较低的基层材料;随着底基层厚度的增加,基层底面水平向附加拉应力减小,故在实际施工中可适当增大级配碎石底基层的厚度。

According to the destruction of uneven settlement of sand-filled subgrade to pavement structure, a finite element analysis model is set up, which can reflect the influence of uneven settlement of sand-filled subgrade on asphalt pavement structure. Through calculation and analysis on the influence of uneven settlement on asphalt pavement structure, adaptabilities of different pavement structure combinations to uneven settlement of sand-filled subgrade are studied. According to the research results, the actual engineering should take effective measures to control the uneven settlement of sand-filled subgrade to prolong the service life of the pavement. In the guarantee of the road surface deflection and road carrying capacity, a lower modulus base material could be chosen. Along with the increase of base thickness, base layer of additional horizontal tensile stress decreases, the thickness of graded broken stone base can thus be increased in the actual construction.