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基于煤层底板破坏形态、现场注浆工程和套管布置方式,建立了底板注浆加固套管作用模型,将套管分段并进行受力分析,阐明了套管和围岩作用与反作用机理,确定了套管的变形特征为衡量底板注浆加固体变形破坏的重要指标,理论推导了弯曲许用应力强度范围内套管容许底板垂向最大位移量公式。最后,数值计算了典型矿井注浆套管对底板变形的影响情况。数据表明施加套管后底板岩体主动区、被动区和过渡区内监测点的垂向位移量分别改变20%,23.2%和27.5%,确定过渡区是套管与围岩耦合作用的关键区域。
Based on the failure mode of coal floor, grouting project and casing layout, a model of casing grouting reinforcement was established. The casing was segmented and subjected to force analysis. The action and reaction mechanism of casing and surrounding rock were clarified. The deformation characteristics of the casing were determined as an important index to measure the deformation and failure of the grouting plus grouting. The formula of the vertical maximum displacement of the casing allowable plate under the allowable bending stress was derived theoretically. Finally, the influence of the typical mine grouting casing on the deformation of the floor is numerically calculated. The data show that the vertical displacements in the active area, the passive area and the monitoring area in the transition zone change 20%, 23.2% and 27.5% respectively after the casing is applied. It is determined that the transition zone is the key area for the coupling between casing and surrounding rock .