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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。
In order to realize the effective control of the roadway regeneration roof, based on the field observation of the regeneration roof and the theoretical calculation of the “three zones” height, the mechanics model and the numerical model of Plankton deformation were established, and the curve equation And sagittal expression, the dominant shape of the roadway section under the regeneration roof and the effect of anchor and shotcrete support are simulated and analyzed. The results show that if there is no support in the short time without roof bolting, the first bearing arch appears after the roof is sunk, that is to say, the Prussian arch is corrected. The height b of the arch is the decrease of the rock solidity coefficient f and the lateral pressure p Function is an increasing function of the semi-span a of the roadway; the cross-sectional shape of the roadway under the reclaimed roof should be a straight wall circular arch, and the anchor and shotcrete support and the roadway arch combine to form the second bearing arch, and the “double arch” structure Effectively controlling the deformation and failure of the regenerated roof, and has the control mechanism of preventing the combination and coordinating deformation. After the field test, the convergence and deformation of the roof of the roadway is small, which can meet the requirements of normal production.