预应力可回收锚索在超大基坑工程中的应用

摘要

以佛山新城CBD超大基坑支护工程为背景，根据可回收锚索的受力状态和实验检测数据，研究表明预应力可回收锚索的锚固长度为2～3 m，锚索张拉锁定后4 d内预应力出现较大的损失，平均损失达20％～40％，后期损失较小，约占5％～10％左右。%Under the background of a large foundation pit engineering in Foshan , according to stress state and experimental test data, studies have shown that effective anchorage length of prestressed recycle anchor cable is 2~3m.It is also concluded that the loss of prestressing force is about 20%~40%of locking force in the first four days , while in the late stage the loss is about 5%~10%of it.