强风化地层中预应力锚索框架锚索拉力试验研究

Experimental study on the tension of anchor cables for pre-stressed anchor cables framework in highly weathered stratum

虽然预应力锚索框架广泛应用于边坡加固,但是对预应力锚索在长期作用过程中的拉力变化研究较少。以云南某高速公路边坡工点为实例,对预应力锚索框架的锚索拉力进行了长期监测。试验研究得出:在强风化砂岩、板岩地层中,锚索预应力损失分为瞬间降低阶段和长期缓慢变化阶段,施工中可以采用超张拉方法进行预应力补偿,同时锚索框架施工中相邻锚索的张拉互相耦合作用很小,在类似地层施工时可不考虑锚索间的相互影响。

Although pre-stressed anchor cables framework is widely used in slope reinforcement,but there is few study on the long-term change of the pre-stressed anchor cables in long-term function process.Taking the slope reinforcement in certain Yunnan expressway as the example,the long-term monitoring to the tensions of pre-stressed anchor cables is carried out.The test study show：the pre-stress losses can be divided into the instantaneous reduce stage and the long-term slow changing stage,the pre-stress losses can be compensated by using the overload strain method,and simultaneously the pull and tension＇ s coupling function of the adjacent anchor cables is very small in the highly weathered sandstone and slate stratum,therefore the anchor cables can be stretched and pulled with the random order in the similar stratum.