Key control technology of double-layer holes for high confined aquifer outburst
To solve the difficulty of setting up high pressure plungers at Ordovician limestone aquifer on the floor of coal mining face,we take No.3315 working face of Gucheng Coal Mine as an example.We put forward a treatment method of surface double-layer directional horizontal holes.The upper holes are used to slow down and reduce the high pressure moving water,and the lower holes are used to quickly intercept the moving water flow.According to the engineering practice,hole distribution,aggregate filling method,grouting method,and grouting completion standards for high pressure water inrush double-layer holes are studied,which defines the key technology of double-layer water inrush disaster treatment.The results show that the double-layer directional hole has an obvious effect on rapid exploration of water inrush channel and construction of water plug,and the water plug rate is 100%.
high pressuredouble-layer directional branch holedecelerating and plugging wateraggregate perfusion
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