With mining depth increase the country rock stability has also a change.

随着开采深度的增加，深井巷道围岩的稳定性也发生了变化。

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The gneissic granite intruded the country rock of Taihua Group as sheet is not mixed granite but magmatic granite, its lithology is simple relatively.

片麻状花岗岩岩性相对单调，它以岩席楔入式侵入太华群围岩，是岩浆型而非混合型花岗岩。

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The results indicated that the field in the stratum is composed of a series of cylinder wave which has the attenuation different from the country rock.

结果表明，层中波场由一系列柱面波组成，其衰减特性与围岩中的规律不同。

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