综放开采回采巷道切顶护巷技术研究

Technology of Roof Cutting for Roadway Protection of Fully-mechanized Caving Mining

厚煤层综放开采时由于一次开采厚度大,导致开采引起的采动压力影响范围、显现程度等均较为明显,给邻近巷道围岩控制工作带来一定影响。2301综放工作面运输巷与邻近的2303回风巷间留设25 m保护煤柱,受2301综放工作面开采影响导致2303回风巷变形量较大,难以满足后续使用需要。结合现场条件及以往研究成果,提出在2301运输巷靠近煤柱侧施工切顶钻孔,通过切顶较少2301综放工作面对2303回风巷影响,并对切顶布置方案、乳化炸药布置以及封孔方式等进行详细设计。现场应用后,2303回风巷围岩变形量受2301综放工作面开采影响较小,回风巷围岩变形量在允许范围内,可满足后续使用需要。

In fully-mechanized caving mining of thick coal seams,due to the large primary mining thickness,the influence range and appearance degree of mining pressure caused by mining are relatively obvious,which has a certain impact on the surrounding rock control work of the adjacent roadway.There is a 25 m protective coal pillar between the transport roadway of 2301 fully-mechanized caving face and the adjacent 2303 air return roadway.Due to the influence of mining of 2301 fully-mechanized caving face,the deformation of 2303 air return roadway is large,which is difficult to meet the needs of subsequent use.Combined with the site conditions and previous research results,it was proposed to build the cutting hole near the coal pillar in the 2301 transport roadway,and to reduce the impact of 2301 fully-mechanized caving work on the 2303 air return roadway through roof cutting,and to design the roof cutting layout scheme,emulsion explosive layout and hole sealing method in detail.After field application,the surrounding rock deformation of 2303 air return roadway was less affected by 2301 fully-mechanized caving face mining,and the surrounding rock deformation of air return roadway was within the allowable range,which can meet the needs of subsequent use.