Research on the Construction Scheme of Grouting Treatment of Pillar Goaf under Large Caverns in Expressway
The grouting treatment project of the goaf in the new construction of expressway belongs to the hidden project,especially for the room-and-pillar goaf,due to the limitations of the investigation method and exploration technology,the section of the goaf presented in the investigation conclusion is a vague concept,and it is impossible to distinguish where is the"room"and where is the"column".Therefore,the room and pillar type goaf is the technical question and difficulty which should be studied and explored in the goaf treatment construction.The paper deeply analyzes the engineering geological conditions of the goaf,accurately identifies the spatial distribution of the goaf through the dense grouting hole construction,and divides the grouting area into"cavity area,caving area and coal pillar area".In the cavity area,the flow range of the slurry is controlled and the loss of the slurry is reduced by using the methods of sealing curtain holes,sand grouting and intermittent grouting.The grouting treatment quality of"big cavity"room and pillar type goaf is guaranteed,and the experience is provided for the treatment and construction of the same type goaf.
expresswaya large voidroom and pillar goafgrouting treatment
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