随着科学技术的发展，大采高开采在厚煤层的生产中得到了广泛应用。针对厚煤层大采高开采，如何提高回采率，减少煤炭资源浪费，实现矿井的高产高效是煤炭行业工作者持续研究的课题。本文围绕区段煤柱合理尺寸留设这一难题，以小保当一号井为工程背景，对该矿112201工作面的合理煤柱参数进行了优化研究，结合理论计算、数值模拟及现场实测确定了该矿的区段煤柱合理尺寸，研究最终取得如下成果： （1）采用围岩强度测试，分析得出煤体强度为中硬；顶板砂岩强度中等稳定；底板岩层强度较高。 （2）通过围岩结构观测得出了：煤柱浅部煤体存在明显的裂隙和破坏现象，但整体完整性相对较好。说明煤柱支撑效果良好，可以进行煤柱尺寸优化。 （3）通过采用安全系数法和极限平衡理论两种思路，分析计算小保当一号井首采面护巷煤柱范围为18.68~24.17m。 （4）对比15m、20m和25m不同宽度煤柱垂直应力分布及塑性区分布特征得出，25m和20m煤柱支承效果良好，且煤柱极限应力值接近，均可以提供足够的支撑强度，煤柱变形处于合理范围内。综合分析选用20m区段煤柱既能达到良好的支护巷道，又能提高煤的采出率，故优先考虑20m煤柱。 （5）通过现场监测分析得出：巷道煤柱帮最大移进量为88mm；煤壁帮由于采用玻璃钢锚杆支护，支护强度较低，变形量相比于煤柱帮更大；顶底板的相对移进量最大达到95mm，锚杆受力增幅在20kN以内，锚杆索受力有足够的富余系数。因此，将煤柱从25m降为20m后，巷道表面位移虽有增加，但增幅很小，围岩变形量不大，说明该煤柱优化结果具有可行性。 本文研究成果为小保当一号井区段煤柱合理尺寸的确定提供了理论基础，并对类似开采条件下区段煤柱的留设提供参考。

With the development of science and technology, comprehensive mechanization of large mining height mining in thick coal seam production has been widely used.How to improve the recovery rate, reduce the waste of coal resources, and realize the high yield and high efficiency of the coal mine is the subject that the coal industry workers continue to study.This article around the section design, the reasonable coal pillar size problem, small insurance when a well as the engineering background, the mine reasonable 2-2 coal seam fully-mechanized working face coal pillar parameters optimized research, combined with numerical simulation and field measurement to determine the reasonable coal pillar size in the section of the mine, research achievements in thick coal seam mining height are broken section width of coal pillar mining research to provide certain reference and guidance.The results are as follows: (1) the strength test of surrounding rock was adopted to analyze the coal body with medium hard strength and the roof sandstone with medium strength.The strength of floor strata is high; (2) from the observation of surrounding rock structure, it is concluded that there are obvious cracks and destruction in the shallow coal and rock mass of the coal pillar, but the overall integrity is relatively good, which indicates that the coal pillar supports well and can be optimized for the size of the coal pillar. (3) through the analysis and calculation of two ideas of safety factor method and limit equilibrium theory, the range of coal pillar of protective roadway on the first mining face of xiaobaodang no.1 well is 18.68~24.17m. (4) by comparing the vertical stress distribution and plastic zone distribution characteristics of coal pillars with different widths of 15m, 20m and 25m, it is concluded that the supporting effect of 25m and 20m coal pillars is good, and the limit stress value of coal pillars is close, which can provide sufficient supporting strength, and the deformation of coal pillars is within a reasonable range.Comprehensive analysis of the selection of 20m section pillar can not only achieve a good support roadway, but also improve the coal recovery rate, so priority is given to the 20m pillar. (5) through on-site monitoring and analysis, it can be concluded that: the maximum displacement in the advance range of the coal pillar side working face in the return air roadway is 88mm respectively.The support strength is lower and the deformation is larger than that of the coal pillar because of the fiberglass bolt support.The maximum relative displacement of the top and bottom plate is 95mm.If the bolt force increase is less than 20kN, the anchor cable force has enough surplus coefficient.Therefore, after the coal pillar is reduced from 25m to 20m, the roadway surface displacement is very small. Although there is an increase, the increase is very small. The surrounding rock deformation is small and tends to be stable, which indicates that the optimization result is feasible. The research results of this paper provide a theoretical basis for determining the reasonable size of coal pillar in xiaobaodang no. 1 well and provide a reference for the retention of coal pillar in similar mining conditions.