According to the ultimate equilibrium principle and Hock-Brown criterion, the ultimate pullout force of prestressed cable is studied and a ultimate-value principle is suggested.

• 结果表明:锚索极限抗拔力取决于锚索破裂面形状、岩体种类、无侧限抗压强度、风化程度以及灌浆材料和灌浆压力等。