The width of fractured zone of pillar is one of the major basis about design of stope stability in strip method mining. The strain energy balance theory is introduced,regarding as the strain energy among the strip ore layer composing of volumetric strain energy,shape strain energy and bending elastic energy. According to the elastic energy balance relationship before and after mining,the model for calculating the width of fractured zone of pillars is derived. The model is applied to cal-culate the width of fractured zone of two pillars in Shanghengshan ore-body,and the calculated results are compared with that of the similar simulation. The widths of fractured zone are calculated as 10. 06 m and 12. 42 m,respectively,which fit well with that of the similar simulation test. The influences of several possible factors to the width of fractured zone in the model are ana-lyzed. The width of fractured zone of pillars has a positive correlation with the mine seam thickness,buried depth of ore-body and the volume-weight of overlying strata,and has an inverse correlation with the compression strength and Poisson's ratio of ore-body. Once the width of fractured zone increased,the width of strip mining increased firstly and then lowered. The research results can provide a certain theoretical guidance to the stability design of level and gently inclined strip pillar.%条带法回采矿床时,矿柱破裂区宽度是采场稳定性设计的主要依据之一.引入弹性应变能平衡原理,视条带矿层中储存的应变能由体变弹性能、形变弹性能及顶板弯曲弹性能组成,根据开采前后弹性能平衡关系导出矿柱破裂区宽度的计算模型.运用矿柱破裂区宽度计算模型对上横山矿床矿体中的2个矿柱破裂区宽度进行计算,计算结果和相似模拟试验对比分析,得到矿柱破裂区宽度的计算结果分别为10.06 m和12.42 m,与相似模拟试验结果吻合较好.分析了矿柱破裂区宽度计算模型中各参数对矿柱破裂区的影响,矿柱破裂区宽度与矿层高度、矿体埋深及上覆岩层容重成正相关,与矿体抗压强度、泊松比成反相关;增加开采条带宽度,矿柱破裂区宽度先增大后减小.研究结果可为水平及缓倾斜条带矿柱稳定性设计提供一定的理论指导.
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