In the plastic limit analysis, the wrinkler's plate is smartly analyzed in yield-line theory to get the critical compression strength of the coal pillar.

在分析过程中，利用机动法对温克尔地基板（弹簧支撑板）进行了塑性极限分析，得出了煤柱抗压强度的临界值。

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While the interfacial bond property is unchanged, the width of plastic zone of pillar increases with the increase of buried depth of coal seam.

当煤层顶底板粘结性能一定时，随煤层埋深的增加，煤柱塑性区宽度增加。

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While the coal seam hardness is definite, the increasing velocity of the width of the plastic zone of pillar decrease with the increase of interfacial bond property between coal seam and roof.

当煤层硬度一定时，随着煤层与顶底板界面粘结性能的提高，煤柱塑性区宽度增长的速度递减；

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