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纤维增强塑料筋锚杆具有的高强度、耐腐蚀特性使其比传统钢锚杆更具应用前景,目前其相关研究尚处于起步阶段。锚固力学特征分析对其应用于锚固工程具有直接的指导意义,对此从纤维增强塑料筋锚杆拉拔试验所得P-s曲线出发,建立锚固段剪切滑移刚度沿程变化的界面黏结–滑移本构模型,该模型包含了对锚杆材料属性、岩土体性质、围岩应力状态以及接触面性质的综合反映。结合受力平衡方程和变形协调方程,以最小势能原理为约束条件,在边界条件下,通过离散迭代求解了端部锚固锚杆在拉拔荷载作用下锚固体轴向应力、侧阻力以及相对滑移的分布演化规律,并从能量角度推导端锚条件下锚杆临界锚固长度的计算模型。算例计算结果与实际工程所测得的规律和趋势相符,验证算法的合理性。该算法能够为纤维增强塑料筋锚杆锚固系统的分析和设计提供理论参考。
Fiber reinforced plastic tendon bolt with high strength, corrosion resistance makes it more than the traditional steel anchor more application prospects, the current research is still in its infancy. The analysis of anchoring mechanical characteristics has direct guiding significance for its application in anchoring engineering. Based on the Ps curve obtained from the pull-in test of fiber reinforced plastic tendons, the interface bond-slip Constitutive model, the model includes a comprehensive reflection of the material properties of the rock bolt, rock and soil properties, stress state of the surrounding rock and the nature of the contact surface. Combined with the force balance equation and the deformation coordination equation, the minimum potential energy principle is used as the constraint condition. Under the boundary conditions, the axial stress, lateral resistance and relative slip of the anchorage bolt under the action of drawing load And the evolutionary rule of the distribution of the anchor bolt, and derives the calculation model of the anchor bolt critical anchorage length under the end anchor condition from the energy point of view. The calculation results of the example are consistent with the laws and trends measured by the actual project, and verify the rationality of the algorithm. The algorithm can provide theoretical reference for the analysis and design of fiber reinforced plastic tendon anchorage system.