Which measure is effective in reducing the accumulation of methane in mine workings?

Increasing the number of ventilation shafts is an effective measure in reducing the accumulation of methane in mine workings because it enhances the overall ventilation system within the mine. More ventilation shafts enable the introduction of fresh air and the removal of stale air, which is crucial in dispersing methane—a flammable gas that can create explosive conditions if allowed to accumulate.

By improving air circulation, the increased number of shafts helps in diluting the concentration of methane, leading to safer mining conditions. Proper ventilation also supports the removal of other hazardous gases and maintains overall air quality within the mine, which is essential for the safety of miners.

In contrast, reducing airflow rates would lead to a decrease in the removal of gases, allowing methane levels to rise. Regular blasting activities could temporarily displace methane but does not provide a systematic way to manage its accumulation. Allowing water accumulation in mine areas could create additional safety hazards like flooding and might not effectively influence methane levels, as saturated areas can potentially lead to different gas issues, rather than alleviating them.