拉力分散型锚索锚固段荷载传递机制

Loading transfer mechanism of dispersion-type tensile cables along anchoring section

预应力锚索是岩土锚固最常用的结构形式之一,使用的锚索类型越来越多。锚索锚固段的荷载传递是控制锚索性能和工程设计的关键,应用剪滞理论分析了锚固段的受力和荷载传递机制,并对拉力分散型锚索的锚固机制进行探讨。分析结果表明,拉力分散型锚索锚固段剪应力在软化段逐渐增加至峰值剪应力,随后减小,其分布模式与现场试验结果比较一致。

Prestressed cable is one of the common ground anchorage forms; and its types become more and more in use. The loading transfer along anchoring section is crucial for controlling cables performances and engineering design. Shear lag theory is applied to analyze loading and load transfer mechanism along anchoring section; and the anchorage mechanism of dispersion-type tensile anchor is discussed. The analytical results indicate that interfacial shear strength of dispersion-type tensile cable gradually increases to peak shear strength （τ0）, and then decreases. The analytical model accords with field test result perfectly.