Research on the failure characteristics and active-passive collaborative control technology for retracement channel in super long working face with large mining height
In response to safety issues such as roadway damage and equipment removal obstruction caused by large deformation and instability of the pre excavation retreacement channel in super long working face with large mining height.Using theoretical analysis,numerical simulation,on-site test and other methods,based on the analysis of the failure characteristics of the retracement channel,the active-passive collaborative control technology of controlling the roof and fixing the wall was proposed.A mechanical model of roof-wall combined instability of super long working face under mining and supporting pressure was established,and based on the relationship between the fracture position of roof and the stability of surrounding rock,the failure mechanism of the retracement channel was revealed.Using UDEC numerical simulation to verify the environment of the retracement channel area,a collaborative control scheme with real-time roof breaking,stacked support and anchor cable was proposed to ensure the stability of the retreat channel.This technology had been successfully applied in the retracement channel of the 226-03 fully mechanized mining face in Huangyuchuan Coal Mine.The monitoring results showed that after the working face was connected,the subsidence of the roof of retracement channel was 75.6 mm,the floor bulging was 95.7 mm,and the deformation of the two sides was 103 mm.The deformation was small,the support efficiency was high,and the cost was low,achieving the goals of stable,safe,and efficient retracement channel in the super long working face with large mining height in Huangyuchuan Coal Mine.
super long working face with large mining heightretracement channelfailure characteristicssupport technologyroof control and side reforcement
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