预应力锚索破坏特性及极限抗拔力研究

以众多试验资料为研究基础，提出了一个描述预应力锚索破裂面形状的双参数方程。在此基础上，根据极限平衡原理及岩体的Hoek-Brown准则，研究了预应力锚索的极限抗拔承载力，并提出了一个极值原理，最后给出一个计算实例。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。

STUDY ON FAILURE CHARACTERISTICS AND ULTIMATE PULLOUT FORCE OF PRESTRESSED CABLE

Based on testing data, a biparametric equation is presented to depict the rupture shape of prestressed cable. 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. A calculation example is given. The results show that the ultimate pullout force is related to the rupture shape of prestressed cable, rock type, unconfined compressive strength of rock, weathering degree, grouting material and grouting pressure, etc. At last, a series of formulas are given to determine the ultimate pullout force and lateral resistance of prestressed cable.