The study looked at how the shape of valleys affects the pressure on coal mining faces. By simulating mining scenarios, researchers found that the absence of certain rock layers can lead to unstable conditions in shallow coal seams. When key rock layers are missing, it can cause increased pressure on mining faces, especially in upper coal seams. This can result in unstable mining conditions and potential accidents. The pressure on upper and lower coal seams follows a pattern of "slope section > valley bottom section > back slope section."