Pre-grouting reinforcement technology and the structural effect of regenerated roof for roadways under destroyed top-coal
Aiming at solving the difficulties in sideway expansion attributed to the broken wall rock in roadways under the top coal damage area,we took the open-off cut at No.32101 working face in Hanzui Coal Industry as the research object.By analyzing the destabilizing mechanism of side wall expansion in the top-coal damage area,roof pre-grouting control technology for the surrounding rock was proposed.A regenerated roof was then constructed through grouting based on the formation of a grout-resisting curtain.The reinforcement effect was verified through numerical simulation,and the results showed that the plastic zone range of the roadway was significantly reduced after grouting.Field application results indicates that after the roof pre-grouting reinforcement,the surrounding rock deformation in the open-off cut at No.32101 working face was small,and the reinforcement effect was good.
top-coal damage zonesadvance pre-groutingbrush expansionsurrounding rock controlroof control
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