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针对无黏性填土,通过模型试验和理论分析研究了低填方上埋式刚性管涵周围的土压力分布特性。基于试验结果和修正的马斯顿理论提出了较为合理的管涵土压力计算模型和计算公式,并根据试验数据确定了计算模型中的关键参数,通过不同埋深的试验工况结果对比表明:该计算模型能较好地反映实际的管涵周围土压力分布模式,在浅埋条件下管顶中心位置处土压力集中现象随管顶填高的增大而渐趋明显。同时,当填高较小时,管土界面法向土压力随分布角度θ增大先增后减;而填高较大时,管土界面法向土压力随分布角度θ增大而增大。
In view of the non-viscous filling, the distribution of earth pressure around the buried rigid pipe culvert with low fill is studied through model test and theoretical analysis. Based on the test results and modified Marston’s theory, a reasonable calculation model and calculation formula of earth pressure on the culvert were proposed. Based on the experimental data, the key parameters of the model were determined. The comparison of the test conditions under different depths shows that: The calculation model can well reflect the actual earth pressure distribution pattern around the pipe culvert. Under shallow buried conditions, the concentration of earth pressure at the center of the pipe roof becomes more obvious with the increase of the filling height. At the same time, when the filling height is small, the normal earth pressure at the soil-soil interface first increases and then decreases with the increase of the distribution angle θ. When the filling height is larger, the normal earth pressure at the soil-soil interface increases with the distribution angle θ.