In the reef clearing construction of the channel project,the impact of the construction on the adjacent buildings needs to be considered if there are adjacent buildings near the reef clearing area.To avoid the adverse impact on existing nearby buildings in the Western Land-Sea New Corridor,Pinglu Canal,channel project,the project uses the cyclic impact of a high-frequency breaker to break the rocks,which is more efficient and environmentally friendly.Aiming at the applicability of the high-frequency hammer for reef clearing in sensitive areas,a numerical simulation calculation model of the high-frequency hammer for reef clearing is established based on 3DEC,the dynamic response rules of the rock mass under high-frequency vibration impact are studied,and the range of application of the HB3600 hammer for the reef clearing construction is proposed.The results show that the HB3600 hammer is suitable for rocks with a compressive strength within 30 MPa and the rock-breaking efficiency decreases beyond this range.The stress generated inside the rock mass under the impact of the breaker gradually decreases as the distance from the hammer tip increases,the vertical stress has a greater impact within the range of 0.95 m and the lateral stress has a greater impact within the radius of 0.5 m.