Failure Mechanism and Control Technology of Thick and Soft Coal Fully Mechanized Caving Roadway under Double Gobs in Close Coal Seams

Figure 20

Distribution of the prestressed field of the grouting anchor cable. (a) Bolts with prestressed 60 kN and anchor cables with prestressed 120 kN. (b) Bolts with prestressed 90 kN and anchor cables with prestressed 150 kN. (c) Bolts with prestressed 120 kN and anchor cables with prestressed 180 kN.

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