Experimental study on grouting diffusion and reinforcement law of grouting backfilling mining in caving zone.

During the test, the degree of compaction and breakage of gangue gradually increased, but the rate of strain increase showed a decreasing trend.

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In the case of single particle size, because the particle size is similar, the slip phenomenon of dirt in the early stage of loading is less, and the AE energy of AE is a combination of frictional AE and crushing AE, showing an increasing trend different from that of continuous gradation.

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