急倾斜煤层走向长壁工作面煤壁和底板容易发生破坏，严重影响工作面的正常推进。通过理论建模、底摩擦实验、数值计算等方法，研究了煤层顶板破断与冒落矸石滑动特征，揭示了不同煤层赋存和开采条件下煤壁破坏机理，并提出了防治煤壁破坏与底板滑移的具体措施。研究发现:急倾斜煤层走向长壁工作面顶板冒落的矸石会对采空区形成不同程度的充填，自下而上依次为“密实充填段”、“不均匀充填段”、“非充填段”3段，而工作面中上部区域由于充填不充分，动压现象明显，容易造成严重的煤壁片帮和底板滑移现象，支架的工况随之也会变差，成为整个工作面围岩稳定性最脆弱的区域，严重影响到工作面的安全高效生产，是采场围岩控制的重点区域;工作面底板稳定性显著影响煤壁的稳定性，实际生产中发现，在煤层赋存和开采条件不同时，煤壁破坏一般会呈现出“塑性-流动”、“挤出-滑移”、“剪切-滑移”3种破坏模式;工作面采用伪俯斜布置不仅可以显著提高煤壁和底板的稳定性，也可以有效阻止液压支架倾倒和下滑，还可以避免工作面飞矸发生，配合整体推刮板输送机和“柔性加固煤壁”等技术可以实现急倾斜煤层走向长壁工作面安全高效开采，有效解决急倾斜煤层机械化开采所面临的一系列岩层控制难题。

The coal wall and floor of the longwall face in the steeply inclined coal seam are prone to damage,which se- riously affects the advance of the working face. By establishing theoretical model,bottom friction experiments,numeri- cal calculations,etc. ,the characteristics of coal seam roof breaking and caving rock sliding are studied,and the coal wall failure mechanism under different coal seam occurrence and mining conditions is revealed. The concrete measures to prevent coal wall damage and floor slip are put forward. The study shows that the caving rock from the roof of the longwall face in steeply inclined coal seams will form different degrees of filling in the goaf. From bottom to top,it forms three sections including “compact filling section”,“uneven filling section” and “non-filling section”. However, due to insufficient filling in the upper part of the working face,the dynamic pressure phenomenon is obvious,which is likely to cause serious coal wall slab and bottom plate slip phenomenon,and the working condition of the support will also become worse,which becomes the most unstable surrounding rock of the whole working face. The fragile area seriously affects the safe and efficient production of the working face,and is the key area for the surrounding rock control of the working face. The stability of the working floor is significantly affected by the stability of the coal wall. In actual production,it is found that when the coal seam occurrence and mining conditions are different,the coal wall failure generally presents three failure modes:“plastic-flow”,“extrusion-slip” and “shear-slip”. The use of a pseudo-tilt ar- rangement at the working face not only can significantly improve the stability of the coal wall and the bottom plate,but also effectively prevent the hydraulic support from falling and sliding, and can also avoid the occurrence of flying gangue at the working face. With the integration of conveyor and the “flexible reinforced coal wall”,it is possible to re- alize the safe and efficient mining of longwall working face in steep coal seam,and effectively solve a series of rock for- mation control problems faced by the mechanized mining of steep coal seam.