Effect of Composite Fibers and Nanosilica on the Properties of Cement-Based Sealing Materials.

5.2 Analysis of Test Data Compared with the change of the extracting concentration of each hole, as shown in Figure 10 , it can be noticed from the data in the comparison test that the initial extracting concentration of single-hole gas of the drill holes with the sealing material of the mining party ranges from 25% to 67%, with an average of 50.1%, and the extracting concentration of single-hole gas of the holes after 22 days of pumping is in the range of 25% to 59%, with an average of 43.8%, which is in a decreasing trend.

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The initial gas extraction concentration of the drill holes using the new cement-based grouting sealing material developed by Group C ranged from 17% to 57%, with an average value of 41.5%, and after 22 days of extraction, the gas extraction concentration of the single hole ranged from 64% to 80%, with an average value of 70.1%, showing an increasing trend of single-hole gas extraction concentration and tending to stabilize gradually.

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