装配式基层道路结构接缝荷载应力分析

Analysis of Loading Stresses in Joints of Assembly Base Pavement Structure

为研究装配式基层路面结构基层接缝的应力情况,通过三维有限元分析方法,分析了装配式基层模量、基层厚度、荷载大小、土基回弹模量和层间接触条件等对装配式基层接缝底部荷载应力的影响。路面结构计算与分析表明:混凝土模量较填缝砂浆模量对结构影响大,不但能减小幅度大于前者的接缝弯沉,而且能从一定程度上增强接缝的传荷能力,基层模量的下降可以有效地减小荷载应力;随基层厚度和土基回弹模量的增加,接缝两侧弯沉值和底部荷载应力显著减小但逐渐趋于平缓,传荷能力增加;接缝弯沉和底部荷载应力在超载下均是呈线性关系显著增长,需严格限制超载重载;接触条件的恶化,接缝弯沉值和底部荷载应力基本增大,由连续状态变为非连续状态变化特别显著。

In order to study the loading stress in b ase joints of assembly base pavement structure,the effects on the load stress of base modulus,base thickness,load size,soil foundation resilient module and contact conditions at the joint on bottom of the assembly base were analyzed by three-dimensional finite element analysis.The calculation and analysis of the pavement structure show thatthe concrete modulus has a greater influence on the structure than the mortar modulus,which can not only reduce the deflection at the joints larger than the former,but also enhance the capacity of joint load transfer to a certain extent;with the increase of base thickness and soil resilient module,the deflection at the joints on both sides and the bottom load stress of the joint decreased significantly but gradually became flat,and the capacity of joint load transfer increased;both deflection at the joints and bottom load stress show a significant increase in linear relation under overload,and the overload should be strictly restricted;with the deterioration of contact conditions,the deflection at the joints of joints and the bottom load stress basically increased,and the change from continuous state to discontinuous state was particularly significant.