路堤下盖板涵的竖向土压力分布

由于盖板在填土压力作用下发生挠曲变形,针对盖板涵对竖向土压力分布的影响,推导了盖板涵竖向土压力分布计算公式.假设盖板发生弹性挠曲变形,填土服从Winkler弹性地基条件,对盖板上修正的Marston填土涵洞竖向土压力分布进行了分析.结果表明,该修正公式考虑了盖板涵内外土柱差异沉降的应力集中效应,可计算由于盖板挠曲变形而引起的土压力重分布.通过对鹤大高速公路某盖板涵进行现场测试以及有限元数值模拟分析,结果显示盖板涵土压力的分布特点与本文理论分析相一致,且理论公式计算结果值与现场实测值吻合较好.

Distribution of vertical earth pressure for slab culvert under embankment

Due to the fact that the cover plate will generate the flexural deformation under the action of filling earth pressure, the calculation formula concerning the distribution of vertical earth pressure for slab culvert was derived aiming at the effect of slab culvert on the distribution of vertical earth pressure. With the assumption that the cover plate generates the elastic flexural deformation and the filling earth obeys the Winkler elastic foundation condition, the distribution of vertical earth pressure for the modified Marston filling culvert on the cover plate was analyzed. The results show that the stress concentration effect of differential settlement inside and outside the earth column of slab culvert is considered in the modified formula. And thus, the modified formula can be used to calculate the redistribution of earth pressure caused by the flexural deformation of cover plate. Through the field test and finite element numerical simulation analysis on certain slab culvert of Heda highway, it is noted that the distribution characteristics of earth pressure for slab culvert is consistent with the theoretical analysis, and the results calculated with the theoretical formula are in good agreement with the measured values.