基于双承载拱的巷道再生顶板控制机理

发布时间：2018-06-20 15:47

本文选题：再生顶板 + 承载拱　；参考：《采矿与安全工程学报》2017年01期

【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。
[Abstract]:In order to realize the effective control of the roadway regeneration roof, based on the theoretical calculation of the regenerated roof field observation and the "three belt" height, the mechanical and numerical models of the regenerated roof of the roadway are established. The curve equation and the expression of the height of the arch are deduced, and the dominant shape of the tunnel section under the regenerated roof is simulated and analyzed. The effect of anchorage and shotcrete support was observed and the roof and floor displacement was observed on the anchor and shotcrete support roadway. The results showed that the first bearing arch of the regenerated roof appeared after the non retaining roof excavation was not supported in the short term, that is, the first bearing arch of the regenerated roof was corrected, and the sagittal height B of the arch was the decrease function of the rock solid coefficient F and the lateral pressure P, and it was an increase function of the half span of the tunnel. The shape of the cross section of the roof under the regenerated roof is suitable for the straight wall circular arch, and the second bearing arch is formed by the combination of the bolting and shotcrete support and the tunnel vault. The double arch structure effectively controls the deformation and destruction of the regenerated roof, and has the control mechanism of resisting the combination and coordinating the deformation, and the roadway roof has smaller convergent deformation after the field test, which can meet the normal production needs.
【作者单位】：山东科技大学矿业与安全工程学院;
【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)
【分类号】：TD327.2;TD353

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