新型BZY模型沙的研制及其特性试验研究

Development and experiment of a newmodel sand BZY particles

本文作者在以往研究和实践的基础上，研制了一种新型ＢＺＹ模型沙，并对该种沙的干容重、起动流速、糙率、沉速、水下休止角等特性进行了试验研究．结果表明：ＢＺＹ模型沙与其它模型沙相比，具有容重可调、粒径范围广、颗粒形态同于天然沙、物化性质稳定等等优点，具有较大的开发研究和推广应用价值，其中某些问题仍需进一步探索．

The selection of model sand and the decision of its properties are the key technique in sediment model experiments.The common model sands,for example.the saw dust,phenolicmoulding powder.plastic bead.etc..have been used successfully in many sediment.model experiments,but they have some shortcomings.Based on the previous research and practice,theauthors developed a new one called BZY sand,and carried out a series of experiment concerningits properties including unit weight(unit dry weight),roughness.initiation velocity, settlingvelocity and repose angle.etc.As comparing with other model sands,the results reflect thatthe BZY sand has many advantages: the unit weight can be adjusted,the particle size rangesvery widely, the particle shape is similar to natural sand,and the physical and the physical and chemical properties are stable.All of these are greatly siginificant for raising the technique of sediment modeltest.So,it is valuable to be spreaded in practice. but some of its properties still need to be studied further.