摘要
以山西新景矿8119工作面为研究对象,由于其顶板坚硬、强度高,在工作面回采过程中受上覆岩层和采动影响,回风巷道煤帮挤压变形严重,顶板整体下沉量大,底鼓明显,造成局部巷道断面尺寸不足,通风、行人困难,从而影响工作面的正常回采。为了保证工作面的顺利推进,结合矿井地质及实际经济情况,提出了爆破切顶卸压的方法。与此同时,为了预防爆破后瓦斯超限,提出了相应的管控措施。结果表明:8119工作面顶板采取爆破卸压处理后,积聚在内部的应力释放出去,顶板完整性遭到破坏,顶板得到了弱化;回风巷顶底板收缩变形量和两帮收缩变形量明显降低,围岩变形控制良好,也没有出现瓦斯超限情况。
This article takes the 8119 working face of Shanxi Xinjing Mine as the research object.Due to the hard and high strength of its roof,during the mining process of the working face,it is affected by the overlying rock layer and mining.The return air roadway will experience severe deformation of the coal wall,with a large overall subsidence of the roof and obvious floor heave,resulting in insufficient cross-sectional dimensions of the local roadway,difficulty in ventilation and pedestrians,and thus affecting the normal mining of the working face.In order to ensure the smooth progress of the working face,combined with the geological and actual economic conditions of the mine,a method of blasting top cutting and pressure relief has been proposed.At the same time,corresponding control measures have been proposed to prevent gas exceeding the limit after blasting.The results show that after the top plate of the 8119 working face was subjected to blasting pressure relief treatment,the accumulated stress was released,the integrity of the top plate was damaged,and the top plate was weakened.The shrinkage deformation of the top and bottom plates of the return air tunnel and the shrinkage deformation of the two sides were significantly reduced.The deformation of the surrounding rock was well controlled,and there was no gas exceeding the limit.
作者
刘利兵
Liu Libing(Huayang Group Xinjing Mining Coal Industry Co.,Ltd.,Yangquan Shanxi 045000,China)
出处
《山西冶金》
CAS
2024年第5期158-160,共3页
Shanxi Metallurgy
关键词
爆破切顶
围岩卸压
围岩变形
顶板弱化
瓦斯超限
blasting top cutting
rock pressure relief
surrounding rock deformation
roof weakening
gas transfinite
