The dynamic response of a deep rock body under mining disturbance is very similar to that of a high-rise building under seismic action, and the whip-tip structure is introduced into the study of the rock body's ultra-low friction effect. The model of the ultra-low friction effect of the whip-tip block is established, and the influence of its structural characteristics on the ultra-low friction effect is studied. The horizontal displacement size of the whipping block by changing the size, position, and aspect ratio of the whipping block was analyzed by using the self-developed experimental device of ultra-low friction effect, and the influence law of the structural characteristic parameters on the ultra-low friction effect was obtained. The results show that: The horizontal displacement time course curves of the whipping tip block under different working conditions are characterized by two stages; The whipping tip block size increases, the horizontal displacement decreases, and the ultra-low friction effect is weakened; Under the effect of vertical perturbation, the ultra-low friction effect of the whip-tip block tends to increase with its position away from the source of perturbation, and there is an interval of significant influence of the ultra-low friction effect on the height-to-width ratio.

The ultra-low friction rock burst is essentially a new type of coal mine dynamic disaster induced by the ultra-low friction effect at the coal-rock interface. Taking Shenyang Hongyang San Mine roof-coal seam-bottom slab as the research object, and a simulation test of ultra-low friction effect of sandstone-coal-sandstone superimposed block under the joint action of axial pressure, vertical disturbance and horizontal impact was carried out the self-developed test device. The effect of coal surface roughness on the horizontal displacement amplitude, horizontal displacement abrupt change time, horizontal acceleration amplitude and horizontal acceleration abrupt change time of the working block was analyzed, and was obtained the influence law of coal surface roughness on the ultra-low friction effect. The results show that: (1) When the sandstone surface roughness is constant, with the increase of the coal surface roughness, the horizontal displacement and horizontal acceleration time history curve of the working block has three-stage characteristics, namely the incubation stage, the excitation stage, and the stable stage; (2) The coal surface roughness has an inflection point of 3.98. When the coal surface roughness is less than the inflection point of 3.98, as the coal surface roughness increases, the horizontal displacement in the excitation stage is greater than the horizontal displacement in the stable stage, the displacement difference decreases linearly, and the ultra-low friction effect weakens; (3) When the coal surface roughness is greater than the inflection point of 3.98, with the increase of the coal surface roughness, the horizontal displacement in the excitation stage is smaller than the horizontal displacement in the stable stage, and the horizontal displacement of the working block increases again. As the absolute value of the displacement difference increases, the ultra-low friction effect is more significant; (4) The horizontal displacement amplitude and horizontal acceleration amplitude show a linear decreasing and then linear increasing law with the roughness of the coal surface; (5) The horizontal displacement abrupt change time and horizontal acceleration abrupt change time increase linearly with the roughness of coal surface, and then increase linearly.