Research and Application of Geotextile in Coal Mine Paste Fill-ing Isolation
At present,our company in paste filling isolation solidification process,the use of general waterproof tarpaulin as iso-lation cloth.In the long-term isolation application,it is found that the tarpaulin has the disadvantages of poor tensile resis-tance,poor water permeability and high cost,as a result,the paste solidification time increases,the mining progress has not been improved,seriously restricting the production of the company's increase in volume.The geotextile has good water and air permeability through field test,but its pore size is small,it can effectively retain the smallest particles of paste and filter off wa-ter flow,and can effectively prevent slurry leakage.Therefore,the water-cement ratio of filling material after entering the fill-ing area can be reduced by filtering water,and the paste setting time can be reduced.After many experiments,we conclude that the bleeding rate is between 3%and 4%,the setting time can be advanced about 3 hours.From the point of view of site isolation speed,setting time,on-site staff feedback,and economic benefits,the application of geotextile as isolation cloth can significantly increase the isolation speed and advancing speed of working face,and significantly reduce the paste setting time,the labor intensity of the workers decreased obviously,and had better economic benefits.
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