Current beam appears original to house (approx 100 year age), (4) 2"x10"s, aligned vertically. Current beam has (3) staggered adjustable steel columns, placed between 8' and 10' along span. Cupping of ...

Intelligent mining has become the development direction and the trend of safe and efficient coal mining 1,2,3. The coal caving automation process in comprehensive release mining can not only improve ...