Innovative withdrawal method for hydraulic support of fully-mechanized mining face under complex soft rock conditions
In view of the composite characteristics of mudstone and sandy mudstone in the roof and floor of No.110206 fully-mechanized mining face in Qingshuiying Coal Mine,as well as the characteristics of soft coal seam and roof water spray in the working face,the se-lection of supporting methods and equipment recovery methods during the end of the working face is particularly important.By analyzing the problems existing in the supporting methods of the end of the working face,the equipment withdrawal channel and the upper and lower mouth of the working face,a combined supporting scheme of active anchor cable beam supporting+anchor cable truss strengthe-ning supporting+anchor cable grouting full-length anchorage+working face outlet anti-bottom arch was proposed.The field implementa-tion showed that this supporting method can better control the subsidence and floor heave of the recovery channel and the roof and floor of the upper and lower mouths of the working face during the withdrawal of the working face.Aiming at the withdrawal of hydraulic sup-port,a special modular steel plate was designed.The head and tail were laid on the weak floor of the withdrawal channel.The support was placed on the steel plate,and the support was dragged to the working surface by winch and recovered by monorail crane.The front fan surface adopted a shield support to support the roof,and the support to be extracted adopted a self-pulling self-way.When the shield support was extracted,the guard plate of the shield support was used as its anti-falling device,which realized the extraction of the sup-port and the adjustment of the direction without winch,and also reduced the operator,implemented safe and efficient rollback.This with-drawal mode was adopted in No.110206 fully-mechanized mining face,and the equipment withdrawal work was completed safely and ef-ficiently,and good use effect was obtained.It provides an innovative withdrawal method for the withdrawal of hydraulic support in work-ing face under complex soft rock and similar conditions.
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