双锚固段新型锚索锚固性能研究及工程应用

Experimental study and application of anchor performance of a new type anchor cable with double anchor

为探究高路堤、深路堑边坡锚固系统耐久性以及锚固效果,研制了一种内外双锚固段新型锚索,从其结构设计、结构特点及锚固机理入手,分析其受力模式与计算方法,并通过室内足尺模型试验分析双锚固段新型锚索锚固效果,试验结果表明,(1)外锚固段有效的起到了双重锚固作用;(2)双锚固段锚索系统能有效避免因锚索失效导致的预应力损失;(3)整个锚固系统能实现反向自锁功能,与传统的锚索比,安全可靠性更高,能有效避免因锚索破坏突发灾难性的安全事故,长期性价比高;(4)工程实例验证石炭系岩关组砂岩、泥岩及深灰色灰岩呈互层地层外固段长度不少于8 m,才能有效地避免外锚头失效自由段预应力不损失。试验结果对正确分析双锚固段新型锚索加固作用机制和工程设计应用具有一定的参考价值。

A new type anchor cable with double anchor is developed to explore endurable and anchoring effect of anchorage system in the slope of high embankment and deep cut slope. Based on its structural design, anchorage mechanism and structural characteristics, the stress model and calculation method are analyzed. The endurable and anchoring effect of the double anchor cable anchorage are analyzed through indoors contrast analysis experiments. Experimental results indicate that:(1) The outer anchorage section played an effective and dual-function anchorage role.(2) Double anchoring section system is able to effectively avoid the prestress loss caused by anchoring failure(3) Compared to the traditional cable, the new type anchorage system is able to realize self-locking function, and demonstrated characteristics of high safety, reliability. Accidents by sudden catastrophic failure of anchor cable can be effectively avoided. Thus, high effectiveness-cost ratio is realized in the long term.(4) The engineering cases show that, the failure of outside anchor head and prestress loss of free section can be effectively inhibited, when the outside solid length of Carboniferous rocks formation sandstone, mudstone and dark gray limestone, with interbedded strata are not less than 8 m, These experimental results can be used as a valuable reference for the correct analysis of the mechanism and engineering design of the new double anchor cable.