The study looked at how coal pillars in underground mines bear the pressure from mining activities. By analyzing the stress distribution and pillar size, researchers found that coal pillars have critical dimensions for stability. They discovered that when the pillar width is within a certain range, it can support the mining stress effectively. However, if the pillar is too small or too large, it may lead to stress concentration and potential failure. This information is crucial for ensuring the safety and stability of underground coal mining operations.