CAJ | 학술논문

为研究堤基内部填充颗粒在何等水力梯度下发生运移，进而流向出流口，最终引起管涌破坏，对砂槽模型试验装置进行了改进，避免出现接触冲刷破坏，以获得理论上发生管涌的临界水力梯度值。试验中考虑了不同细料含量、填充密度、渗径等条件下管涌临界水力梯度的变化，试验结果较为接近公式计算值。在此前提下，考虑了堤基内部存在渗流通道对管涌临界水头的影响，分析了渗流通道大小及通道距出流口远近对临界水力梯度的影响，得到了比较合理的结论。
위연구제기내부전충과립재하등수력제도하발생운이，진이류향출류구，최종인기관용파배，대사조모형시험장치진행료개진，피면출현접촉충쇄파배，이획득이론상발생관용적림계수력제도치。시험중고필료불동세료함량、전충밀도、삼경등조건하관용림계수력제도적변화，시험결과교위접근공식계산치。재차전제하，고필료제기내부존재삼류통도대관용림계수두적영향，분석료삼류통도대소급통도거출류구원근대림계수력제도적영향，득도료비교합리적결론。
This study was designed to determine the hydraulic gradient under which the inner particles of dike foundation can be dragged to outlet and thus cause piping.For obtaining the theoretically critical hydraulic gradient of piping,the device of flume model test was improved in order to avoid the phenomenon of contact erosion.The critical hydraulic gradient of piping under dif-ferent conditions such as content of fine particles,packing density and length of seepage path was studied.The results of test agree well with the value computed by formula.Under this precondition,the effect of seepage channel in inner dike foundation on critical hydraulic gradient of piping and the effect of diameter of seepage channel and distance between the channel and outlet on critical hydraulic gradient are studied and some reasonable conclusions are reached.