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以邢台—临西高速公路试验段工程为背景,基于实测的分层沉降数据,借助弹性理论公式推导得出应力扩散系数的计算方法,并利用PLAXIS有限元软件,对施工期路基的塑性区开展情况展开数值模拟,以确定该方法的适用范围。同时,提出了能够表征地质条件对应力扩散系数的影响因子,通过绘制该因子与应力扩散系数的关系曲线进一步揭示硬壳层的应力扩散规律。结果表明,应力扩散系数具有明显的时间效应和数值分布范围。在上述工作基础上,将应力扩散系数引入到地基沉降计算中,提出适用于双层路基的、改进的分层总和法及其计算流程,经工程实践验证,该方法具有简单、实效的特点。
Taking Xingtai-Linxi Expressway pilot section as the background, based on the measured stratified settlement data, the calculation method of stress diffusivity was deduced based on elastic theory formula. The PLAXIS finite element software was used to carry out the plastic zone of subgrade during construction The situation is numerically simulated to determine the scope of application of the method. At the same time, the influencing factors that can characterize the stress diffusivity of geological conditions are put forward. The stress diffusivity of the hard shell is further revealed by plotting the relationship between the factor and the stress diffusivity. The results show that stress diffusion coefficient has obvious time effect and numerical distribution range. Based on the above work, the stress diffusion coefficient is introduced into the calculation of foundation settlement. An improved layered summation method and its calculation procedure are proposed for two-layer roadbed. The engineering practice shows that the method is simple and effective.