两帮实体煤矩形巷道围岩变形力学分析及支护研究

Deformation Mechanics Analysis and Support Research of Surrounding Rock in Rectangular Roadway of Two Sides Solid Coal

煤矿巷道两帮煤体相对顶底板岩层强度低、可变形性大,两帮煤体变形对巷道围岩整体稳定性有着重要的影响。为了控制煤矿巷道帮部变形量,应用结构力学力法相关原理建立矩形巷道两帮端部为固定端的力学模型,依据材料力学相关知识研究两帮围岩的挠度方程,并分析其挠度变化趋势。结合现有研究成果,进一步计算并比较锚杆间排距在1 200 mm×1 200 mm、1 000 mm×1 000 mm、800 mm×800 mm下的帮部挠度。采用FLAC^(3D)数值模拟软件分析帮部在3种不同支护密度的挠度变化趋势,结果显示锚杆间排距在800 mm×800 mm时效果最好,帮部最大挠度比无支护时减小约34.5%。

Compared with the roof and floor strata,the two sides of coal body in coal mine roadway have low strength and great deformability.The deformation of two sides of coal body has an important influence on the overall stability of roadway surrounding rock.In order to control the deformation of coal mine roadway sides,the mechanical model with the ends of two sides of rectangular roadway as the fixed end is established by using the relevant principles of structural mechanics.According to the knowledge of material mechanics,the deflection equation of surrounding rock of two sides is studied,and the change trend of deflection is analyzed.Combined with the existing research results,the deflection of the side of the bolt is further calculated and compared under the row spacing of 1 200 mm×1 200 mm,1 000 mm×1 000 mm and 800 mm×800 mm.FLAC^(3D)numerical simulation software was used to analyze the deflection variation trend of the side under three different support densities.The results showed that the effect was the best when the row spacing between bolts was 800 mm×800 mm and the maximum deflection of the side was reduced by about 34.5%compared with that without support.