Research on comprehensive treatment technology of coal seam roof water
There is a roof sandstone aquifer overlying the roof of the 6503 transportation roadway,and the problem of large water inflow is easy to occur during the roadway excavation.It is not only easy to cause the instability of the roof mudstone layer,increase the difficulty of surrounding rock control,but also affect the efficiency of roadway excavation.Combined with the site conditions of 6503 transportation roadway,it is proposed to comprehensively treat the roof water by means of advanced directional long borehole drainage,bolt(cable)full-section bolting and grouting,chemical grouting of surrounding rock,spraying WG waterproofing agent and concrete in surrounding rock of roadway.After the engineering application,the surrounding rock of the 6503 transportation roadway is basically not watered during the excavation,and the roadway excavation is basically not affected by the roof water.The excavation speed is maintained at more than 300 meters/month,indicating that the comprehensive treatment technology of roof water used in the field has achieved good results.
Roof aquiferRoadway excavationDirectional long boreholeGrouting reinforcement
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