Through the self-developed pipeline testing system, the paper studies the critical conditions of jamming and the method of safety transportation under different velocity, particle size and concentration conditions of the pipeline testing system for coarse grains. The result shows that;①The particle size and concentration of coarse particles have important effects on the safety transportation system. With the increase of particle size and concentration, the critical velocity increased, and when the transportation velocity is greater than the critical velocity,it makes the transportation safe; ②At a certain particle size,the larger the inclination is,the lower critical velocity needed at pipeline jamming for coarse grains; ③ In the case of pipe blockage, the critical conditions of the highly-efficient delivery for coarse grains depends on the concentration and velocity.%通过自行设计的管道试验系统,研究在不同流速、粒径和体积浓度条件下,粗颗粒堵管的临界条件及其安全输送的方法.试验结果表明:①颗粒的粒径和体积浓度对粗颗粒系统安全输送有重要的影响,随着粒径和体积浓度的增大,临界流速提高,且当系统的输送速度大于临界流速时方可实现系统的安全输送；②在粒径一定的条件下,随着倾角的加大,粗颗粒在弯管处发生堵管所需要的临界流速降低；③在堵管的情况下,粗颗粒高效安全输送的临界条件主要取决于体积浓度和流速.
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