【摘要】 针对大采高工作面存在的端面冒顶问题，采用数值模拟对俯采、仰采及水平开采三种不同状态下的顶板稳定程度和变化规律进行研究。通过理论研究，分析支架在三种不同开采方式下的阻力分布情况，提出了通过前移液压支架合力作用点的方法，可以提高支架的支护效果，间接增强顶部岩体连续性，控制顶板的拉应力，从而控制顶板冒落。以ZY20000/34/70D型支架为例，分析结果表明：通过调节液压支架的阻力分布，水平开采时，使千斤顶垂直分力处于1000～2000 kN之间；仰采时，使垂直分力处于600～1200 kN之间；俯采时，使垂直分力处于320～640 kN之间运行，可以有效的提高大采高工作面顶板稳定性，保证大采高工作面的安全生产。更多还原

【Abstract】 Aiming at the roof caving at the end face of high-cutting mining face, numerical simulation is used to study the stability degree and change law of the roof under overhead mining, back mining and horizontal mining. Through theoretical research, the resistance distribution of the support under the three different mining methods is analyzed, and the method of shifting the hydraulic support’s joint force point forward is proposed, which can improve the support effect, indirectly enhance the continuity of the roof rock and control the tensile stress of the roof, so as to control the roof caving. Taking ZY20000/34/70D type support as an example, the analysis results show that: by adjusting the resistance distribution of hydraulic support, the roof stability can be effectively improved and the safe production can be ensured for the high-cutting working face, specifically, the vertical force of jack is recommended to be maintained between 1000～2000 kN, 600～1200 kN, 320～640 kN, when mining horizontally, mining up, and mining down, respectively.更多还原