移动角是保护地面建筑物及井下巷道免受采煤有害影响留设保安煤柱的重要参数。它直接决定保安煤柱的大小。如果采用的移动角值偏大,则使建筑物仍然发生严重变形,甚至损坏,使所留设的矿柱起不到保护作用;其数值偏小,则使煤柱尺 Movement angle is to protect the ground buildings and underground tunnels from the harmful effects of coal left an important pillar of the security parameters. It directly determines the size of security pillars. If the moving angle is too large, then the building still serious deformation, or even damage, leaving the pillar to play less than the protective effect; its value is too small, so that the coal column ruler