Abstract: During the process of using orepass in underground mines， the first collision of ore on the orepass wall when moving in the orepass has a great effect on the failure of the orepass wall. It is of great significance to study the movement trajectory of ore block in the orepass and determine the collision range between ore and orepass wall for the support of orepass wall. Taking an orepass in an underground mine of Liaoning as an example， the influence of the ore or rock blocks on the collision range under different initial motion conditions is analyzed， and the distribution range of the initial collision location is determined based on the kinematics theory. The results show that:①The initial collision position between the ore rock and the orepass wall is related to the speed， direction angle and movement time of the ore rock when it enters the orepass. When the structure parameters of the orepass are fixed ， the speed of the ore rock enters the pass is constant， and the velocity direction angle determines the impact range of the ore and rock on the shaft wall.②With the increasing of the initial movement direction angle of the ore or rock block， the distance of ore or rock block movement before the collision between the ore or rock block and the orepass wall of the orepass is gradually shortened， and the impact position is increasing higher，the impacted side of the orepass wall forms two symmetrical arc-shaped oblique impact zones 9.23 m below the pass.③The randomness of ore movement will affect the extent and scope of the orepass wall damage， and under the repeated impact of the rock flow， the position and range of the impact on the orepass wall tend to be concentrated，which is the result of cumulative damage.The above study results can provide theoretical support for orepass wall support.

Key words: orepass wall, direction angle, impact, range of image damage