In the experiment, contact force of unconfined particle layer in the impact crushing course was measured and the contact parameters were estimated based on bilinear contact model.

• 试验结果表明,有物料层的钢-物料层-钢冲击破碎,其恢复系数和接触刚度远小于无料层的钢-钢冲击,并随物料层厚度的增大而减小,但物料粒度的影响较小。