Theoretical analysis shows that coal pillars plastic zone width not only with mining depth, mining height, but with the recovery rate.
理论分析表明，煤柱塑性区宽度不仅与采深、采厚有关，而且也同采出率有关。
A formula of the stress and the width of plastic zone in strip coal pillars is derived by strictly mathematical calculation.
通过数学运算推导出条带煤柱塑性区应力及宽度的表达式。
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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