The generalized model and parameter equation for the internal fracture surface of tensile type anchor cable anchorage section are constructed, and the calculation model of ultimate bearing capacity is derived based on the principle of limit equilibrium. The shape of the internal fracture surface in the anchorage section and the expression of its parameter equation are experimentally studied, and the variation law of the parameter equation and fracture range with the diameter of the anchor cable and confining pressure is analyzed. The parameter equation is substituted into the calculation model to realize the calculation and verification of the model. Through theoretical derivation, a calculation model of ultimate bearing capacity of anchor cable is obtained, which comprehensively considers the average shear strength of anchorage section, the shape of fracture surface, fracture range and confining pressure. The tests show that according to the magnitude of the confining pressure on the anchorage section, the internal fracture surface takes on two shapes: cylindrical and trumpet‐shaped, the parameter equation of trumpet‐shaped fracture surface obeys logarithmic distribution approximately. The coefficient a decreases with the increase of confining pressure but increases with the increase of anchor cable diameter, the constant b increases with the increase of confining pressure but decreases with the increase of anchor cable diameter. The ranges of horizontal and vertical fracture decrease with the increase of confining pressure, and increase with the increase of anchor cable diameter. The deviations between the theoretical calculation and the experimental results are less than 6.5%.

中文翻译：

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张拉式锚索极限承载力计算模型及锚固段内部断裂面形状研究

建立了张拉式锚索锚固段内部断裂面的广义模型和参数方程，并基于极限平衡原理推导了极限承载力计算模型。对锚固断面内部断裂面形状及其参数方程表达式进行了试验研究，分析了参数方程和断裂范围随锚索直径和围压的变化规律。将参数方程代入计算模型中，实现模型的计算和验证。通过理论推导，得到综合考虑锚固断面平均抗剪强度、断裂面形状、断裂范围和围压的锚索极限承载力计算模型。试验表明，根据锚固断面围压的大小，内部断裂面呈现圆柱形和喇叭形两种形状，喇叭形断裂面的参数方程近似服从对数分布。系数A随围压的增大而减小，随锚索直径的增大而增大，乙随围压增大而增大，随锚索直径增大而减小。水平裂缝和竖向裂缝的范围随着围压的增大而减小，随着锚索直径的增大而增大。理论计算与实验结果偏差小于6.5%。