Method for reducing coal pressing range under building structure under thick unconsolidated formation condition

The invention relates to the field of coal pressing treatment modes under buildings and structures, in particular to a method for reducing the coal pressing range under the buildings and structures under the condition of a thick unconsolidated formation. The isolation belt is formed by grouting after the isolation grouting drill hole is constructed, the unconsolidated formation in the protected area is isolated from the external unconsolidated formation, when the coal seam on the periphery of the protection coal pillar is mined, the external unconsolidated formation is stretched to be separated from the isolation belt, and the unconsolidated formation in the protected area is not affected due to the isolation effect of the isolation belt; and the tensile cracks are filled through the construction grouting drill holes. According to the method for reducing the coal pressing range under the building structure under the thick unconsolidated formation condition, the influence of the unconsolidated formation on pro