Zoning and application of grouting working face in separation layer of overlying rock on the inner side of stop mining line
During the grouting process of reducing settlement in the overlying rock separation layer,under the designed slurry parame-ters,in order to accurately and real-time determine whether the grouting results meet the requirements of the primary key layer not breaking and the class Ⅰ protection standard level of protected buildings(structures)on the surface,the paper wass based on the rock movement angle,the"masonry beam"mechanical model,and the grouting zoning theory of the key layer and overlying rock separation layer.Starting from the protected boundary of the protected building(structure),along the direction of the working face and in the re-verse mining direction,the corresponding ground surface of the grouting filling area on the inner side of the stop mining line was divided into four levels:control zone,warning zone,transition zone,and sinking zone.Draw the data obtained from settlement observation into a slip and sinking deformation curves,and combine it with the fourth level zoning to form a sinking analysis chart.This chart can intuitive-ly analyze the grouting results and indirectly infer the actual occurrence status of the main key layer breaking,fracturing,sinking dis-turbance deformation,integrity,etc.,,thereby achieving the goal of real-time guidance for overlying rock separation layer grouting,which has guiding significance for similar projects.
control areawarning areatransition zonesinking zonesinking analysis chart
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