Existing studies of the structural strength of longwall mining hydraulic support are mainly focused on the force acting on individual supports instead of the general mechanical characteristics of the support group in a fully mechanized coal seam working face. This study combines theoretical analyses and experiments to investigate the mechanical characteristics of a longwall mining hydraulic support group and the stiffness of key support components under different working conditions. The theory of a beam on an elastic foundation was applied to construct a mechanical model for the hydraulic support group. The location and the size of loads on the top beam were determined. Field tests yielded data on the deflection of the roof and loading on the support group along the working face, where the stiffness of end supports varies. The transverse load distribution of the top beam and the offset loading coefficient at different locations along the working-face direction were obtained. A three-dimensional model was constructed for the support group while assembling virtual hydraulic supports using modern virtual modeling theories and methods. Finite element analysis was used to analyze the strength of the hydraulic support. The weakest areas of key components were found to be pinholes connecting the column cylinder to the base and roof of the mine. These results can be applied to achieve secure and stable operations of hydraulic supports in the working face of a thin coal seam, thereby improving the safety and production efficiency of mining operations.

现有的长壁开采液压支架结构强度研究主要集中在单个支架上的受力，而不是综采工作面支架组的一般力学特性。本研究结合理论分析和实验，研究不同工况下长壁采矿液压支架组的力学特性和关键支架部件的刚度。应用弹性地基梁理论构建了液压支架组的力学模型。确定了顶梁上荷载的位置和大小。现场测试获得了有关屋顶偏转和沿工作面支撑组加载的数据，其中端部支撑的刚度各不相同。得到了顶梁横向荷载分布以及沿工作面方向不同位置的偏载系数。利用现代虚拟建模理论和方法，在装配虚拟液压支架的同时，构建支架组的三维模型。采用有限元分析方法对液压支架进行强度分析。关键部件最薄弱的区域被发现是连接柱筒与矿井底部和顶部的针孔。该研究成果可实现薄煤层工作面液压支架安全稳定作业，从而提高采矿作业的安全性和生产效率。