褶皱作为地壳岩层运动形成的地质构造之一，其附近岩层分布较大的残余不均匀构造应力，是诱发煤矿冲击地压的主要因素。针对这一问题，以义马煤田千秋煤矿21221工作面为工程地质背景，建立了褶皱构造赋存条件下的数值模型，施加了不均匀构造应力，分析了工作面开采时褶皱构造区域应力场的演化特征，研究了采动影响下褶皱构造不同区域矿压显现规律。研究结果表明:褶皱构造的原岩应力场的分布具有明显的空间分布区域性，即垂直应力和水平应力在向斜和背斜轴部表现出不同的分区特性，向斜轴部处出现了应力集中。随着工作面推进过向斜和背斜，水平应力和垂直应力在采空区顶板和底板均形成了椭圆形卸压区，垂直应力卸压区演化沿褶皱向斜或背斜法线方向逐渐扩大，垂直应力在工作面超前区域出现了一定范围的应力集中，应力集中区远离轴部扩大；水平应力在工作面垂直方向上较远处区域出现了应力集中，应力集中区逐步向顶板和底板远处发育，水平应力在卸压区内顶板应力的释放程度要明显高于底板。在工作面过褶皱轴部和翼部阶段，工作面超前支承压力的峰值随开采距离的增加而增大，应力集中系数则先增大后减小。工作面自背斜轴部俯采时工作面前方支承压力较大，自向斜轴部仰采时较小。当工作面过褶皱轴部时，直接顶受压状态的应力集中程度逐渐减小，减小的过程伴随着能量释放激增的现象，此时极易诱发冲击地压。

As one of the geological structures formed by crustal movement，the non-homogeneous stress distribution of nearby strata during the fold area is the main factor inducing coal burst.Based on the engineering geological background of No.21221 mining face of Qianqiu Coal Mine in Yima Mining Area，the numerical model is established by applying non-homogeneous structural stress to analyze the evolution characteristics of the stress field in the fold area during the coal seam mining，and strata behavior regularity in different areas of fold structure is also studied.The results show that the distribution of in-situ stress field in the fold area has obvious regional spatial distribution.It means that vertical stress and horizontal stress show different zoning characteristics in fold syncline and anticline axis，and stress concentration occurs at the syncline axis.As the working face advances through the syncline and anticline，the horizontal stress and the vertical stress form the oval pressure relief area in the roof and floor.The evolution of vertical stress relief zone is gradually expanding along the normal direction of fold syncline or anticline，and the vertical stress concentration area appears in front of the working face，and it extends away from the axis.The horizontal stress concentration area appears in the vertical direction of the working face，and it gradually develops to the far distance of the roof and floor，and the release degree of horizontal stress in the roof is higher than that in the floor during the relief area.As the working face advances through the syncline and anticline，the peak value of abutment pressure increases with the increase of mining distance，and the stress concentration coefficient increases at first and then decreases.Compared with the process when the mining face is mining from the syncline axis，the abutment pressure is larger when the mining face is mining from the anticline axis.When the mining face advances to the fold axis，the stress concentration degree of immediate roof compression state decreases gradually，and the process of reduction is accompanied by the phenomenon of sudden increase in energy release，which is extremely prone to induce the coal burst.