中文摘要：

基于试验研究，探讨了不同颗粒粒径（d）、堵管高度（H）、流体平均流速（V）条件下粗颗粒在垂直扬矿管道中堵管后再起动的临界条件。研究结果表明：（a）d和日是影响单位长度压差（△P）与y关系的2个重要参数。（b）当△P与V呈线性关系时，垂直管道堵管后颗粒将无法实现再起动；反之，如若二者呈非线陛关系，则颗粒可实现再起动。（C）基于试验结果提出的颗粒再起动时的临界流速、临界单位长度压差计算公式符合精度要求。

英文摘要：

Through a self-developed pipeline test, the critical conditions of jam and re-initiation of coarse particle motion in pipelines of a deep-sea mining vertical riser with different particle sizes, heights of jam, and average flow velocities were investigated. The results are as follows- （a） the particle size and the height of the jam have a significant effect on the relationship between the pressure gradient and average flow velocity; （b） when the relationship between the pressure gradient and average flow velocity is linear, the pipeline is jammed, and if it is nonlinear, the particle motion can be re-initiated; and （c） a critical condition formula was developed and verified by experimental data, and it met accuracy requirements.