关键词: 预应力损失, 锚索, 高边坡, 三峡船闸

Abstract:

In order to understand the long-term performance of the pre-stressed anchorage cables installed in high slope of ship-lock of Three Gorges Project, the statistical analysis on the pre-stress variation process was carried out on the basis of the 15 years′ monitoring data from 73 anchorage cables. The magnitude and distribution characteristic of the pre-stress loss at the locking moment and after the locking till December of 2014 are presented. The mode of the sequential curve of pre-stress loss after the locking are divided and the evolution laws under different modes are summarized and compared. The 3-stage pattern is the most representative, namely the abrupt spurt stage, randomly up-down attenuation stage and periodically stable fluctuation stage. The reason and influential factors of pre-stress loss are summarized in terms of different stages. The relationship between the pre-stress loss and the stability of slope is briefly discussed.

Key words: pre-stress loss, anchorage cables, high slope, ship-lock of Three Gorges Project