堤坝下游管涌险情发生的临界流速和渗流量及其防汛应用

引用水力学中单个潜水球体起动平衡时的阻力系数试验曲线，结合颗粒土料的渗流阻力试验中孔隙率的关系，提出了鉴别堤坝下游地基各土层发生管涌的临界流速和渗水量观测方法。为方便计算还给出了阻力系数试验曲线的不同流态(达西流和非达西流)经验公式。为应用方便，又算出常规土层的管涌临界流速和渗水量的对照表格，供汛期防洪查用。现场实施只...

Critical Velocity and Seepage Discharge for Identifying Piping Risks below the Downstream Embankment and Its Application in Flood Control

During flood season,piping risk in the downstream of embankment is the most dangerous hidden trouble.The discrimination of piping in the past was generally based on seepage gradient which is not only limited theoretically by Darcy's flow but also inconvenient in practice.In view of this,a method of identifying piping below embankment,which can be called critical velocity or unit seepage discharge observation method,is suggested in this paper.It is based on the experimental curve of drag coefficients for sin...