煤矿铁路专用线上的桥涵,因受采煤地面下沉移动的影响,都有不同程度的破坏,严重者甚至危及运输安全。因此,对重要的桥涵常采取预留保护煤柱的办法。这种办法的弊端使矿产资源得不到充分的开采利用,给国家造成巨大的损失。为了研究在保证铁路运输安全的前提下采出保护煤柱的方法,兖矿 The bridges and culverts on the special railway line for coal mines have been damaged to varying degrees due to the subsidence and movement of the coal mining surface. In severe cases, they even endanger the transportation safety. Therefore, the important bridges and culverts are often reserved for the protection of pillars. The drawbacks of this approach make mineral resources are not fully exploited, resulting in huge losses to the country. In order to study the method of protecting coal pillar under the premise of ensuring railway transportation safety,