ANALYSIS ON INFLUENCING FACTORS AND COUNTERMEASURES OF PRE-STRESS LOSS OF ANCHOR CABLE IN SLOPES AT ONE NUCLEAR POWER PLANT

Anchor cable failure is mainly caused by pre-stressed anchor cable's pre-stressing loss. Prestress loss is ineluctability, but it could be taken measures to ensure the effect of the anchor cable prestress. This paper analyzed the rule of pre-stress changing, the factors that make the anchor cable's pre-stress changing and also the impact on the pre-stress changing by means of anchor cable's monitoring data and slope deformation monitoring data. The results show that the fastest stage of pre-stress loss occurred in a period of time after anchor cable tension; optimization measures can be used to ensure the initial effective pre-stress; the period of pre-stress quickly reduce continuous long time in slope reinforcement with anchor acble.