为解决厚煤层综放双巷布置工作面巷间煤柱的留设问题，以某矿四盘区4301工作面运输顺槽与辅助运输顺槽之间的煤柱为工程背景，首先对巷间煤柱进行理论分析：一次采动影响后将巷间煤柱沿倾向划分为采动影响区、相对稳定区和锚杆支护区，应用极限平衡理论分析得出了一次采动影响区的宽度为2.82 m，进而得出巷间煤柱的宽度为7.83 m。其次，应用数值模拟的方法系统地分析了宽度分别为4、6、8、10、12、15、20 m时，在两次采动影响下巷间煤柱的应力演化、破坏、巷道围岩变形规律；一次采动影响后，随着煤柱宽度增大，髙应力由实体煤向煤柱内转移；给出了最大临界尺寸、最小临界尺寸的定义，并指出巷间窄煤柱宽度应小于最大临界尺寸。综合分析数值模拟研究结果，同时结合理论分析结果及煤柱留设原则，最终确定巷间煤柱宽度为8 m。最后，通过现场工程实践验证了所确定的巷间煤柱宽度的合理性。研究结果对类似条件下综放双巷布置工作面巷间煤柱宽度的确定具有参考意义。

This study is to determine the width of coal pillar between roadways of the fully mechanised caving face with double roadways layout in a thick coal seam. The coal pillar between haulage gate and auxiliary haulage gate of the 4301 working face in the fourth panel was selected as a case study. Firstly, based on theoretical analysis, the pillar between roadways was along tendency divided into mining influence area, relative stability area and bolt supporting area after the first mining. The width of first mining influence area was 2.82 m determined by using the limit equilibrium theory, and the width of pillar between roadways was subsequently obtained as 7.83 m. Then, a numerical method was conducted to systematically simulate the laws of stress evolution, failure, and roadways deformation of pillars with the widths of 4, 6, 8, 10, 12, 15 and 20 m under the secondary mining influence. It is found that after the first mining, the high stress transfers from the coal wall to the pillar with the increase of pillar width. Besides, the definitions of the maximum and the minimum critical sizes are given. It is pointed out that the width of the narrow pillar should be less than the maximum critical size. By synthesising numerical results, theoretical results and principles of the pillar, the most favourable width of the pillar between roadways is suggested as 8 m. Finally, the rationality of the pillar width is verified by engineering practice. The results can provide a reference for the determination of narrow pillar between roadways of fully mechanised caving face with similar mining conditions.