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从锚杆拉拔试验的荷载位移曲线出发,建立锚固界面的非线性剪切滑移模型以及锚杆锚固段荷载传递的非线性微分方程,获得锚杆锚固段的轴力和界面剪应力解析解,对非线性剪切滑移模型曲线特征以及锚杆锚固段的轴力和界面剪应力分布与传递特征进行分析。结果表明:建立的非线性剪切滑移模型曲线具有剪应力峰值点,随着剪切位移的增加,界面剪应力呈现先上升再下降的变化趋势,即该模型合理地考虑锚固界面的软化特征。拉拔荷载作用下,锚杆锚固界面经历弹性黏结阶段、弹塑性变形阶段以及快速软化阶段3个阶段,界面剪应力分布逐渐从单调递减曲线演变为单峰曲线,且界面剪应力作用范围随着拉拔荷载的增大而逐渐向锚杆远端扩展,以致极限状态下整个锚固界面发生软化而失效破坏。建立的轴力和界面剪应力解析解简单实用,适用于分析整个张拉过程中锚杆锚固段的荷载传递特征,为全长黏结式锚杆锚固段荷载传递机制研究提供理论参考。
Based on the load-displacement curve of anchor pull test, the nonlinear shear-slip model of anchor interface and the nonlinear differential equation of load transfer in anchor section are established to obtain the analytical solutions of axial force and interfacial shear stress The characteristics of nonlinear shear-slip model and the axial force and interfacial shear stress distribution and transmission characteristics of anchorage section are analyzed. The results show that the established nonlinear shear-slip model curve has the peak value of shear stress. With the increase of shear displacement, the interfacial shear stress increases first and then decreases. That is to say, the model reasonably considers the softening characteristics of the anchoring interface . Under the action of drawing load, the anchorage interface of anchor undergoes three stages of elastic bonding stage, elasto-plastic deformation stage and rapid softening stage. The interface shear stress distribution evolves gradually from monotonous decreasing curve to unimodal curve, and the interface shear stress range with Pull the load increases and gradually extended to the distal anchor, so that the ultimate state of the entire anchoring interface softening failure failure. The established analytical solutions of axial force and interfacial shear stress are simple and practical. They are suitable for analyzing the load transfer characteristics of the anchorage section of the anchor during the whole process of tensioning, and provide a theoretical reference for the study of the load transfer mechanism of the anchorage section of the full-length bonded anchor.