High-pressure grouting process of water-rich weathering fracture rock formation below thick unconsolidated formation for coal mine
A high-pressure grouting, thick and loose technology, applied in the direction of wellbore/well components, earthwork drilling, sealing/packing, etc., can solve the problems of inability to realize grouting in weathered and fractured rock formations, insufficient solid pipe material thickness, and slurry leakage to the ground and other problems, to achieve the effect of large effective diffusion radius, long grouting time, and avoid waste of grout
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[0028] See Figure 1-5 , Showing the high-pressure grouting process of the water-rich weathered fractured rock under the thick loose layer for coal mines of the present invention.
[0029] The high-pressure grouting process for the water-rich weathered fractured rock under the thick loose layer for coal mines includes at least the following steps:
[0030] A) Solid pipe grouting: Perform the first drilling in the hole position of the grouting hole, the drilling depth is preferably to a certain depth of the clay layer 102 under the loose layer 101, so as to complete the work of the first-level drilling 11, and then proceed The lower pipe operation of the orifice tube 21, the outer diameter of the orifice tube 21 is smaller than the diameter of the primary borehole 11, and the length is greater than the depth of the primary borehole 11. Preferably, the orifice tube 21 The outer diameter of the first-level borehole 11 is 30mm smaller than that of the first-level borehole 11. The grou...
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