【摘要】 锚杆界面的应力分布及传递规律的分析对巷道围岩锚固机理的研究至关重要.通过全长锚固砂浆锚杆的室内拉拔试验,测试了锚杆杆体与砂浆黏结界面之间的轴向剪应力分布规律.从细观力学角度入手,采用PFC颗粒流软件对锚杆界面力学试验进行了数值仿真模拟.结果表明,锚杆界面剪应力在轴向方向上分布不均匀,呈先增后减的形式传递,最大值位置距离拉拔端口较近;沿着锚杆径向,随着距离的增大,剪应力按负指数函数规律递减;黏结参数的变化,会出现不同类型的锚杆加固失效形式.锚杆界面轴向剪应力数值模拟结果与试验结果有较好的一致性,颗粒流模型为锚固机理的细观尺度研究提供了可行性.更多还原

【Abstract】 The analysis of stress distribution and transfer law of the bolt interface is essential for studying the bolting mechanism of roadway surrounding rock.By indoor pull-out test of the full-grouted mortar bolt,the distribution law of shear stress is tested between bolt-rod and the mortar bonded interface.From the view of micromechanics,the mechanical test of bolt interface is simulated using the software PFC.The result indicates that the shear stress of blot interface is unevenly distributed in the axial direction.The shear stress is transferred in the form of increasing first and followed by a decrease.The maximum value is close to the pull-out port.Negative exponential law is used to describe the shear stress,which decreases progressively with the increase of distance in the radial direction of bolt.The change of bonding parameters can result in different failure forms of bolt reinforcement.Because numerical simulation and experimental results are in good consistency,particle flow model provides a feasible mechanism for the micro-scale study of the anchorage mechanism.更多还原