A detection method for overburden rock isolation grouting filling layer

Abstract

The invention provides a method for detecting an overlying strata isolation grouting filling position. In the processes of mining a coal face and auxiliary grouting drilling and grouting filling, the flowing condition of grout liquid in a detection grouting drill hole is observed; when the grout liquid starts to flow out of the detection grouting drill hole, a drilling rod and a water pipe tied up on the drilling rod are inserted into the drill hole, and the bottoms of the drilling rod and the water pipe are both connected with rubber plugs, wherein the diameter of each rubber plug is equal to the bore diameter of an open hole of the drill hole; under the obstruction effect of the rubber plugs, the water pipe can only introduce out the grout liquid in the open hole section below the rubber plugs to the earth surface; in the processes of rod drilling and placing the rubber plugs, the place depth and the grout liquid flow change of the water pipe are recorded, so that all the grout liquid filling positions are detected. The drill holes used for the grout liquid filling positions are all grouting drill holes, it is unnecessary to construct detecting drill holes separately after the grouting construction is over, the normal grouting of the drill holes and the subsidence control effect are not affect, and the problem that in the prior art, a large amount of cost and time consumed due to the fact that the grouting filling position detecting drill holes are constructed separately after the construction is over is solved.

Description

technical field [0001] The invention relates to a layer detection method for isolated grouting and filling of overlying rock, and is especially suitable for detecting the grouting and filling layer for pressing coal under mining buildings through isolated grouting and filling of overlying rock in coal mine mining. Background technique [0002] In recent years, coal mine overlying rock isolation and grouting filling technology has played a very active role in coal mining in the villages under buildings, ensuring the normal mining succession and service life of coal mining enterprises (especially aging mines), and protecting buildings. Safety. In addition, this technology has also been successfully applied in coal mining under structures and railways, and has achieved remarkable results. This technology involves constructing multiple groups of grouting boreholes perpendicular to the coal seam from the surface above the coal mining face. Deformation of overlying strata and ef...

AI Technical Summary

Problems solved by technology

This method may not have problems in effectively capturing the grouting filling layers of the overburden rock, but it cannot help engineers and technicians to accurately determine where the actual grouting filling layers of the overlying rock are. For example, patent ZL201210164930.1 discloses a A double-hole staggered-layer drilling arrangement method for isolation and grouting filling of overlying rock during mining, specifically involves the height of the grouting drilling depth from the roof of the coal seam, but does not disclose the accurate overlying rock grouting filling layer and overlying rock grouting Filling horizon detection method

In the grouting filling project, this kind of "shotgun method" grouting filling layer design method cannot solve the following problems: whether the borehole grouting fills to one location or multiple locations, the distance between these locations, and the distance between these locations and the coal seam.

This type of method requires special drilling for construction, so the cost is extremely high, often reaching hundreds of thousands of yuan; It is beneficial to dynamically control the filling layer and adjust the drilling layout and other parameters in the grouting filling project

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