Deviatoric stress evolution and time step control technology of retreat roadway surrounding rock in fully mechanized working face.

11 , as the width of the ECP decreases, the middle of the ECP is in an elastic state, and the maximum value of the f shows an increasing trend and moves towards the non-mining side; The two sides of the ECP are in a plastic failure state, and the maximum value of the f of the non-mining side shows an increasing trend, while the maximum value of the f of the mining side shows a decreasing trend followed by an increasing trend.

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