Failure Mechanism and Control Countermeasures of Weak Surrounding Rock in Wanfu Coal Mine Pump House
In order to solve the difficult problem of supporting large cross section cavern in deep soft rock,this article takes the repair of the-820 m horizontal main drainage pump house cavern in Wanfu Coal Mine as the background.The failure characteristics of surrounding rock,the displacement amount of the two sides,and the deformation characteristics of the masonry body are analyzed respectively by means of drilling peeping instrument,leveling instrument,and layout strain transducer.The failure mechanism of the large buried depth and large cross section cavern is clarified.At the same time,aiming at the failure characteristics of the cavern,a reinforcement measure combining grouting to fill rock cracks and rebuild masonry passive support is proposed.The surrounding rock of the cavern is filled with weak areas through grouting,then exert masonry and grouting anchor cable support.Currently,the surrounding rock of the pump room is in a stable state for a long time without significant deformation occurence,and the deformation of the cavern surrounding rock is significantly controlled.
soft rock supportdrilling peepinggroutingfield test
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