Water pressure effect and influence mechanism of coal mechanical property degradation under mine water immersion conditions.

As shown in Fig 10 , with the increase of water immersion pressure, the solid bearing structure of coal samples is weakened, resulting in the decrease of its energy storage limit, and the U e gradually decreases, and compared with the coal samples of group A, the average U e of the coal samples of group B ~ D shows an increasing trend; and the ratio of the corresponding U d to U 0 shows an increasing trend with the increase of the water immersion pressure.

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As the effective carrying area decreases, the corresponding values of σ and E show a decreasing trend. 3.2.

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