上埋式涵洞顶部垂直土压力的塑性分析

Plastic Analysis of Vertical Pressure on Top of Culverts

涵洞上覆土体采用非线性应力应变关系——简化的双曲线模型、地基采用线弹性模型,利用力的平衡和变形协调条件对上埋式钢筋混凝土涵洞顶部土压力进行探讨,所得洞顶垂直土压力的计算公式包含涵洞尺寸、上覆土体厚度、地基和填土性质。结果表明上等沉降面的高度随填土厚度和地基弹性模量的增大而增大;洞顶土压力系数随填土厚度的增加呈现先增后减的趋势,

Plastic model is used for the earth fill and elastic model used for the foundation. Based on the conditions of force equilibrium and deformation accordant, the vertical pressure on top of culverts is studied. The calculation formula obtained contains some parameters, such as the size of culverts, the depth of earth fill, the characters of the foundation and earth fill etc. The calculation result shows that the depth of equal settlements surface increases as the increasing of the foundation elastic modulus and earth pressure coefficient on the top of culverts is showing a tendency to increase first and decrease afterwards along with the increasing of the earth fill depth.