“…As the soft coal seam easily collapses, the hole sealing device is difficult to be sent. Moreover, the hole sealing device needs to be matched with expansion cement, and the operation process is cumbersome. , The bore is sealed by inorganic materials, simple operation, low cost, have certain block of surrounding rock around the borehole fissure, but material curing slower, hole sealing time is long, cement mortar material shrinkage resistance, especially the problem of hole sealing is lax in fissure zone, lead to water, air drilling, influence the effect of gas drainage and coal injection. In addition, the cement mortar is prone to dehydration, shrinkage, and cracking in the solidification process, which makes it difficult to guarantee the hole sealing effect.…”