排洪明槽底板按弹性地基基础梁进行的受力分析

在遵崇高速公路一填筑路基上设置的U型大断面排洪明槽结构设计中，将其底板按弹性半无限平面上的基础梁（属共同变形理论）进行受力分析，计算出地基反力、梁截面内力（剪力、弯矩）作为梁设计的依据。介绍了该方法计算的理论和步骤，并与假定地基反力按直线分布的计算结果进行了比较，显示出共同变形理论计算的合理性。排洪明槽经数年使用，完好无损。

Force Analysis on Bottom Board of Open Channel for Flood Discharge as Elastic Foundation Beam

In the structural design of U-type large-section open channel for flood discharge set on filling subgrade of Zun Chong Highway, the bottom board is deemed as the foundation beam on elastic semi-infinite plane （attribute of common deformation theory ） to conduct the force analysis; as a result, the subgrade reaction, internal force at beam section （ shearing force, bending moment） are obtained as the basis of beam design. The paper introduces the calculation rationale and steps thereof and compares with the result by the assumption of subgrade reaction in straight-line distribution showing the rationality of the calculation with common deformation theory. The open channel for flood discharge has been in service for several years and keeps intact.