Analysis On Prestress Loss Of Anchorage Cable

Though it is widely used in projects with anchorage cable, the prestress change rules of the cable are still not researched thoroughly and systematically, especially the prestress loss after lock and the lasting prestress of cable in cracked rock slopes. Based on the systematically monitoring and analysis in a slope reinforcement project, the prestress loss after lock, short-term, as well as long-term prestess change rules are studied, and also the influence of rainfall to the cable prestress state is monitored and discussed. It is found that the prestress loss after lock is largely based upon the shrink of the anchorage cable after lock, but the friction can to some degree infect this shrink quantity. The short-term prestress loss is nonlinear, the same is the long-term prestress loss m ost o f w hich c an b e div ided int o t hree s tages. T he influence o f rain t o t he prestress loss should be considered respectively. If the slope is not stable, the rain can infect the stabilization of the slope and then infect the prestress state of the anchorage cable, otherwise, it has no infection to the prestress state.As to the long-term prestress loss of the cable, which is due to the creep of the medium materials, new mechanical modal was established, and the change rules were analyzed. It was also analyzed with finite element method. The two results were both tally with the results of the experiments, which proved the applicability of the modals. With the theoretical analysis or finite element method, not only the long-term change rules of the cable prestess can be estimated, when the creep parameters are known, but also the creep parameters can be computed by analyzing the prestress loss data got from actual projects.