Abstract: To study the dynamic response characteristics of the advanced support under the disturbance of roadheader, based on the theory of overburden strata, a coupled dynamic model was built for advanced support and roof rock. According to empirical formulas of cutting resistance of cutting teeth and traction resistance, a formula was deduced of for vertical force on the cutting head, which was taken as the disturbance excitation of roadheader. Dynamic response simulations and experimental analysis of advanced support were carried out under the above disturbance. The contact stiffness of the advanced support roof and the support stiffness of the advanced support were increased to 2.5×10⁶ kg/s² respectively. That resulted in that the displacement amplitudes of the front and top plates were reduced by 66.78% and 54.73%, 58.91% and 63.78% respectively. When the contact stiffness was increased to the critical value of 1.5×10⁶ kg/s², the vibration suppression of roof displacement decreases. It was found that increasing advance support and roof contact stiffness or advance support stiffness can reduce the effects of the disturbance on advanced support and roof rock displacement, and that roof rock subsidence would be stabilized when the forepoling-roof rock contact stiffness of the advanced support reaches a critical value.

Key words: advanced support, roadheader disturbance, roof rock, dynamic response, stiffness