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针对路堤下软土硬壳层地基的受力特性,采用ABAQUS有限元分析软件,分析了路堤填土高度对硬壳层底面竖向应力的影响,结果表明:随着填土高度的增加,硬壳层底面竖向应力将由压应力变为拉应力,且拉应力最先出现在路肩下的硬壳层底面。为了避免在硬壳层底面出现拉应力,分析了反压护道对硬壳层底面竖向应力的影响,结果表明:反压护道的高度对硬壳层底面竖向应力的分布形态有很大的影响,不同填筑高度的路基,均存在一个最佳的反压护道高度,使得路基宽度范围内硬壳层底部的应力较小且分布比较均匀。
According to the stress characteristics of soft soil foundation under embankment, the influence of embankment fill height on vertical stress of hard shell bottom is analyzed by ABAQUS finite element analysis software. The results show that with the increase of fill height, The vertical stress on the bottom of the shell will change from compressive stress to tensile stress, and the tensile stress first appears on the bottom of hard shell below the shoulder. In order to avoid the tensile stress on the bottom of the hard shell, the effect of anti-pressure guard on the vertical stress on the bottom of the hard shell is analyzed. The results show that the vertical stress of the bottom of the hard shell is highly distributed Large impact and embankment with different filling height, there is an optimal back pressure guard height, which makes the stress of the hard shell bottom smaller and distributed more evenly in the roadbed width.