土坝下软基涵洞施工力学分析

Construction mechanical analysis on the culvert of soft foundation under soil dam

通过逐级新增单元的有限元方法,模拟了土坝下软基涵洞周围土体分层填筑的施工过程。土体采用邓肯-张双曲线模型,涵洞与土体之间采用Goodman型摩擦接触单元,较好地反映了涵洞周围土体的位移场、应力场及涵洞结构内力,为实际工程设计提供了可靠依据,是涵洞结构计算的一种有效方法。

By using FEM of increasing elements,the incremental construction of the culvert of soft foundation under soil dam was simulated.Duncan-Chang hyperbolic model was adopted,and Goodman friction-contact elements were employed between the culvert and the soil.The displacement field,stress field of soil around the culvert,and the structural internal force of the culvert were revealed.The simulation method is one of the effictive methods for culvert structure calculation.