基于双承载拱的巷道再生顶板控制机理  

Control mechanism of roadway regenerated roof based on double load-bearing arches

作　　者：马文强[1] 王同旭[1] 江东海[1] 曲孔典 

机构地区：[1]山东科技大学矿业与安全工程学院,山东青岛266590

出　　处：《采矿与安全工程学报》2017年第1期47-53,共7页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51379116);山东省重点研发计划项目(2015GSF116012);山东科技大学研究生科技创新基金项目(YC150202)

摘　　要：为实现对巷道再生顶板的有效控制,基于再生顶板现场观测和"三带"高度的理论计算,建立巷道再生顶板修正普氏拱力学模型和数值模型,推导了修正普氏拱的曲线方程及矢高的表达式,模拟分析了再生顶板下巷道断面的优势形状及锚喷支护效果,并对现场锚喷支护巷道进行了顶底板移近量观测。结果表明:无留顶掘巷后若短期内无支护,再生顶板下沉后出现第一承载拱,即修正普氏拱,拱的矢高b是岩石坚固性系数f和侧向压力p的减函数,是巷道半跨度a的增函数;再生顶板下留顶掘巷的断面形状宜为直墙圆拱,锚喷支护与巷道拱顶组合形成第二承载拱,"双拱"结构有效控制了再生顶板的变形破坏,具有让抗结合、协调变形的控制机制;现场试验后巷道顶板收敛变形较小,可满足正常生产需要。To achieve effective control of roadway regenerated roof, mechanical and numerical models of roadway regenerated roof were built via field observation and theoretical calculation of ＂three zones＂ height, modified natural arch curve equation and its rise expression were further deduced, optimized roadway section shape and shotcreting support effect was analyzed through numerical simulation, and roof to floor convergence was observed at the project site. The results have shown that regenerated roof tends to fall and form the first bearing arch after driving roadway without top remaining, it is a modified natural arch whose rise b is decreasing function of rock solid coefficient f and side pressure p, but in- creasing function of half span of roadway a; applicable roadway section shape should be strait wall and semicircular arch while driving with top remaining under regenerated roof, shotcreting support and arch crown are composed to form the second bearing arch, the double arch structure has the control mecha- nism of resist-let conjoint and compatible deformation, which effectively prevents the deformation fail- ure of regenerated roof. Roadway roof convergence can meet production requirements after field test.

关 键 词：再生顶板 承载拱 普氏拱 锚喷支护 控制机理 

分 类 号：TD353[矿业工程—矿井建设]