低填方钢波纹管涵洞受力变形特性及垂直土压力计算

分析了填筑施工动态过程中钢波纹管涵洞的受力变形特性及管涵周围土压力分布规律，基于马斯顿理论，构建了一种垂直土压力的计算公式，结合试验数据和有限元计算对其进行验证.结果表明:应变随填土高度呈波动增长态势，在管侧填土高度为3.6m时，内外部测点应变出现最大值；填土完成后，内部测点存在受拉或受压状态，而外部测点以受拉为主；水平向和竖向变形随管侧填土高度的增加而增加，呈竖向椭圆形；管涵顶部的垂直土压力最大，垂直土压力系数随倾角的增大而增加.

Deformation Characteristics and Vertical Earth Pressure Calculation of Low Fill Steel Corrugated Pipe Culverts

The stress and deformation characteristics of steel corrugated pipe culverts and the distribution law of earth pressure around the pipe culvert during the dynamic filling process were analyzed. Based on the Marston’s theory， a calculation formula of vertical earth pressure was constructed and verified by experimental data and finite element calculation. The results show that the strain fluctuation increases with the filling height. When the filling height is 3.6m， the strain of the internal and external measuring points reaches the maximum values. After the filling completed， the strain of the internal measuring points can be both in tension or compression， while strain of the external measuring points are mainly in tension. The horizontal and vertical deformation increases with the increase of filling height at the pipe side， which takes on a vertical ellipse shape. The vertical earth pressure at the top of the pipe culvert is the largest， and the vertical earth pressure coefficient increases with the inclination angle.