考虑基层超宽的水泥混凝土路面荷载应力计算

Loading Stress in Cement Concrete Pavement Structure with Base Widening

依据Winkler地基不等尺寸双层板模型,采用有限元法,考虑基层超宽,分析了水泥混凝土路面面层和基层结构荷位临界点的位置;给出了不同轴载作用下,面层和基层结构荷位临界点的荷载应力计算式,研究发现随着基层超宽,纵缝中部面层荷载应力降幅在0-38%,横缝下基层荷载应力降幅为0-42%,纵缝中部下方基层荷载应力在垂向上由0逐渐增大,在平行方向上先增大后下降.此外,提出了当量轴重系数的概念,探讨了面层和基层多轴车当量轴重系数的变化规律.

Based on a mechanistic model of double slabs with unequal dimension on Winkler foundation and an analysis of the critical locations of pavement and base, the loading srtess formulas for pavement and base at critical locations under various types of axle loads are presented by adopting the finite element method and taking the base widening effect into consideration. It is discovered that with the increase of base widening, the loading stress will fall 0-38% in the middle of pavement and 0-42% at base underneath transverse joint ends,however, the loading stress will grow gradually from 0 to some extent at base perpendicular to longitudinal joints and increase subsequently to a fall at base parallel to longitudinal joints. In addition, a concept of equivalent axle load is put forward;the rules of a equivalent muti-axle load coefficients for pavements and base are discussed.