为了提高煤炭资源的回收率,提高开采效益,改变特厚煤层大煤柱护巷为小煤柱护巷势在必行,其中又以临空小煤柱侧巷道支护尤为关键。......

Accidents such as support failure and excessive deformation of roadways due to drastic changes in stratabehaviors are fr......

The EGAT Mae Moh Mine is the largest open pit lignite mine in Thailand and it produces lignite about 16 million tons ann......