神东煤田主要赋存浅埋近距离煤层,多数矿井上煤层都已开采结束,进入下煤层开采阶段.上下煤层区段煤柱的布置方式会直接影响覆岩与地表的下沉和裂隙的发育,使原本脆弱的生态环境进一步恶化.为确定合理的煤柱错距,以石圪台煤矿2-2 煤和3-1 煤开采为工程背景,结合物理和数值模拟开展研究.研究表明:当煤柱错距小于40m时,上下区段煤柱裂隙场叠加发育,上煤层区段煤柱沉降;当煤柱错距等于 40m时,上下煤层区段煤柱裂隙场分离,上区段煤柱达到充分沉降;当煤柱错距大于 40m时,地表下沉与覆岩裂隙发育变化不大.故石圪台煤矿2-2 煤和3-1 煤的合理煤柱错距应大于40 m.
Study on the reasonable offset of section coal pillars in shallow and close coal seams
Shendong coalfield mainly contains shallow and close coal seams.Most of the upper coal seams of the mine have been ex-ploited and the mining of the lower coal seams is started.The arrangement of coal pillars in the upper and lower coal seam sections will directly affect the subsidence of overburden and surface and the development of cracks and fissures,which will further deteriorate the o-riginally fragile ecological environment.With the 2-2 coal and 3-1 coal mining in Shigetai Coal Mine as engineering background,the reasonable offset distance of section coal pillars is studied combeind with physical and numerical simulation.The results show that when the offset distance of the coal pillars is less than 40 meters,the fracture fields of the coal pillars in the upper and lower sections are su-perimposed,and the coal pillars in the upper sections settle.When the offset distance of the coal pillars is 40 meter,the fracture fields of the coal pillars in the upper and lower sections are separated,and the coal pillars in the upper sections reach full settlement.When the offset distance between coal pillars is more than 40 meters,the development of surface subsidence and overburden fractures do not change much.Therefore,the reasonable coal pillar offset distance of 2-2 coal and 3-1 coal mining in Shigetai Coal Mine should be more than 40 meters.
shallow and close coal seamrepeated miningsection coal pillarreasonable offset
万方数据
维普
