随着煤炭开采技术的发展，大采高采煤方法已成为我国各大矿区尤其是陕北侏罗纪煤田各矿区的重要采煤方法。然而对于大采高工作面回采过程中上覆岩层结构及运移规律的研究并不透彻。小纪汗煤矿11215大采高工作面在回采过程中发现部分液压支架安全阀开频繁启，为了更好的管理该工作面，所以本文对小纪汗煤矿11215大采高工作面顶板来压规律开展相关研究。 小纪汗煤矿主要开采2号煤层，煤层平均倾角2°，煤层均厚4.56m，其一侧为11213工作面采空区、一侧为规划的11217实体煤工作面，各工作面间区段煤柱宽度为20m，11215大采高工作面回采过程中顶板会先后存在两种边界支撑条件，即三边固支，一边简支的前段和两边简支，两边固支的后段。 本次研究以小纪汗煤矿11215大采高工作面为工程背景，首先基于对工作面上覆岩层的结构的分析，建立合理的力学模型，分析其基本顶及关键层层位，并计算出当前模型下工作面周期来压步距；其次是采用FLAC3D数值模拟软件分别对前、后两段工作面覆岩运动破断过程及围岩应力变化进行了模拟，通过运算得到工作面在不同边界支撑条件下基本顶的周期破断情况和来压步距；最后对前、后两段回采期间工作面来压强度、来压步距、液压支架工作阻力等进行了现场矿压观测，总结分析工作面在不同边界条件下矿压显现规律。 通过以上研究结果表明：通过对前、后两段工作面矿压显现的规律的对比，得知后段工作面回采时工作面中下部压力水平增高、来压更为剧烈，建议考虑提高该区域液压支架的支撑强度。该研究不仅对该矿井的工作面部顶板管理和安全高效回采具有指导意义，而且同时可为类似地质条件矿井的开采提供参考依据。

With the development of coal mining technology, large mining and high mining has become an important coal mining method in many mining areas in China, especially in Jurassic coal field in northern shaanxi. However, the study of overburden rock structure and migration law in the process of large mining height working face is not thorough. During the stoping process of 11215 mining height working face in xiaojihan coal mine, it was found that some hydraulic support safety valve opened frequently. In order to better manage the working face, this paper carried out relevant research on the roof pressure law of 11215 mining height working face in xiaojihan coal mine. Xiaojihan coal mining no. 2 coal seam, the average Angle of coal seam 2 °, thick coal seam are 4.56 m, the side of 11213 working face, a side for planning 11217 entity coal working face, the face section width of coal pillar is between 20 m, 11215 large mining height in the process of mining roof will support there are two kinds of boundary conditions, namely 3 edges clamped, one simply supported the front and both sides simply supported and clamped on both sides of back. This study takes the 11215 large mining height working face of xiaojihan coal mine as the engineering background. Firstly, based on the analysis of the structure of overlying strata on the working face, a reasonable mechanical model is established, its basic roof and key layers are analyzed, and the pressing step under the current working face cycle is calculated. Secondly, FLAC3D numerical simulation software was used to simulate the overburden movement breaking process and surrounding rock stress change of the front and back working faces respectively. The periodic breaking situation of the basic roof of the working faces under different boundary support conditions and the pressure step distance were obtained through calculation. At last, the in-situ observation of the working face's compressing strength, compressing step distance and working resistance of hydraulic support during the preceding and the latter two stages of stoping was made, and the law of the working face's ore pressure development under different boundary conditions was summarized and analyzed. The above research results show that: through the comparison of the law of ore pressure development in the front and back sections of the working face, it is known that the pressure level in the middle and lower sections of the working face increases and the pressure becomes more intense during the mining of the working face in the back section, so it is suggested to consider increasing the support strength of the hydraulic support in this area. This study not only has a guiding significance for the management of working face roof and safe and efficient stoping in this mine, but also can provide a reference for the mining of mines with similar geological conditions.