【摘要】 为了研究面间煤柱充填置换过程中充填体的稳定性，以陕西榆神矿区某矿地质条件为背景，分别建立了掘进期间、一次回采期间、二次回采期间的充填体载荷计算模型，得到了满足充填体稳定的临界宽度值。通过室内试验给出了符合充填置换强度要求的充填材料配比方案；借助数值模拟，分析了充填体的应力及弹塑性区分布特征。研究表明：8、12、16、20 m不同充填体宽度条件下，在掘进期间，充填体应力集中系数依次为1.79、1.61、1.55、1.54，充填体塑性区发育范围均为2 m，主要破坏形式为剪切破坏；在一次回采期间，充填体应力集中系数依次为3.66、3.26、3.04、2.93，充填体中部弹性区范围依次为0、3、5、10 m；在二次回采期间，充填体应力集中系数依次为4.78、4.19、3.91、3.74，充填体中部弹性区范围依次为0、2、4、8 m。随着充填体宽度的增加，充填体应力集中系数的减小速率趋于平缓，应力分布曲线逐渐呈现了“双峰一谷”的形态。结合理论分析认为，充填体宽度不小于16.7 m时，充填体可以保持良好的稳定性。更多还原

【Abstract】 In order to study the stability of filling body in the process of filling and replacement of interface coal pillar, based on the geological conditions of a mine in Yushen Mining Area of Shaanxi Province, the calculation models of filling body load during tunneling, primary mining and the secondary mining were established respectively, and the critical width value satisfying the stability of filling body was obtained. The filling material ratio scheme meeting the requirements of filling replacement strength was given through laboratory tests, and the stress and elastic-plastic zone distribution characteristics of filling body were analyzed by numerical simulation. The research shows that under the conditions of different filling body widths of 8 m, 12 m, 16 m and 20 m, the stress concentration factors of the filling body are 1.79, 1.61, 1.55 and 1.54 respectively during the tunneling period, and the development range of the plastic zone of the filling body is 2 m, and the main failure form is shear failure; during the first mining period, the stress concentration factors of the filling body are 3.66, 3.26, 3.04 and 2.93 respectively, and the range of the elastic zone in the middle of the filling body is 0 m, 3 m, 5 m and 10 m respectively; during the secondary mining period, the stress concentration factors of the filling body are 4.78, 4.19, 3.91 and 3.74 respectively, and the elastic zones in the middle of the filling body are 0 m, 2 m, 4 m and8 m respectively. With the increase of the width of the filling body, the decrease rate of the stress concentration coefficient of the filling body tends to be gentle, and the stress distribution curve gradually presents the shape of “double peak and single-valley”.Combined with theoretical analysis, it is considered that the filling body can maintain good stability when the width of the filling body is not less than 16.7 m, and the research results provide a theoretical basis for the filling and replacement of interface coal pillar under similar geological conditions.更多还原