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为了分析高速公路拓宽路基病害机理,以京石高速公路拓宽为工程背景,在FLAC环境下利用Fish函数方法建立了高速公路路基拓宽的数值分析模型,研究了地基沉降对拓宽路基内竖向应力、水平应力和剪切应力的影响,结果表明:在路基拓宽中路基顶部拼接处首先出现拉应力,随着地基沉降的发展,路基顶部拼接处的拉应力区不断发展,并引起路基和路面出现纵向开裂;由于拓宽路基填筑高度不同,路基竖向附加应力分布不均,从而使得路基横向出现不均匀沉降;剪应力主要集中在拓宽路基中部,对拓宽路基病害贡献不大.最后提出了拓宽路基病害防治措施.
In order to analyze the disease mechanism of expressway to broaden the roadbed and broaden the Jing-Shi freeway as an engineering background, a numerical analysis model of expressway embankment widening was established by using Fish function method in FLAC environment. The effect of foundation settlement on vertical stress, Horizontal stress and shear stress. The results show that tensile stress occurs first at the splicing point of subgrade at the roadbed broadening. With the development of foundation settlement, the tensile stress zone at the splicing place at the top of the subgrade continuously develops and leads to the longitudinal Cracking and cracking. Due to the widening of embankment filling height, the vertical additional stress in subgrade is unevenly distributed, which leads to the uneven subsidence of subgrade in horizontal direction. The shear stress mainly concentrates on widening the middle of subgrade and does little contribution to the expansion of subgrade disease. Disease prevention and control measures.