Study on grouting reinforced technology of roadway affected by dynamic pressure

in order to solve the roadway retained difiut problem of the high cutting coal mining face.the borehole T/V observation on the sie rcadway deformaionwere applied to a study on the roadiway defomation law and coal wall alure zone. A layer grouting metnod was provided and a rational groutig opporunity was set up.The industral ral resutshowed that nfuenced by the mining operations,the roadway would form fill seepage zone( 0 ~ 3 m)directional seepage zone( 3.0~ 64 m).seeage shieided area( 6.4 ~ 8.1 m) and insitu ock seepage zon1e( within 8.1 m) insequences from the exemnalto interma Tmhe layer grouting method could beapplied to sove the grout leakage problem efe ctively and coud improve the grouting volume of the borehole.The grouting opportunity of the shallow borehole could beseleced at an ntial deformaton stae from 24 ~ 58 m in the front of the coal minin face and the grouting opporunity of the deep borehole should be selected at the adefomation veroctyretarding stae fron 7 m in a front ofth cal mining faceto 13 m at the rear of the coal mining face.The sie industial tial showed that the convergence ofthe two sidewalsat the grouting reinforced section was 448 m in max and the conwvergence ofthe two sidewalis at the no grouting section was 11 mm in max.The grouting reinforcement effect of the roadway sidewalls was obvious and could provide favorable conditions to the roadway to be retained.