Roadway surrounding rock damage characteristics Figure 3 illustrates the distribution of the plastic zone at different locations of the 21,102 transportation roadway relative to the 21,101 working face. From (a), it is observed that when the roadway is 120 m ahead of the working face, it is not affected by the superimposed pressure from the work face, and the plastic zones in the ribs continue to develop. As the roadway continues to be excavated, the overall plastic zone of the roadway does not undergo significant changes. The maximum depth of the top