Abstract
Considering the interaction among anchor cable, frame beam and rock mass, a new model of prestress loss of anchor cable was established. The accuracy and applicability of the new model were verified by comparing the field monitoring data and the calculation results of existing models. In addition, based on the new model, the effect of the re-tension of the anchor cable at different time nodes was analyzed, and the later compensation time of anchor cable prestress was discussed. The research shows that: the accuracy of the new model is higher after considering the effect of the frame beam, the new model can not only calculate the loss of prestress of anchor cable, but also accurately predict the time when the prestress of anchor cable reaches the stable stage. The ideal effect of prestress compensation can be achieved when the anchor cable is re-tensioned at each time point after 20 days of the construction completed. The original prestress loss of the anchor cable is different, and the re-tension effect is also different, the greater the loss of the original prestress of the anchor cable, the more obvious the prestress compensation effect during the re-tension.
Highlights
During the construction of highways and railways, slope excavation will change the original stress state of a slope, and accelerate the weathering speed of new exposed rock mass [1,2,3,4]; it is necessary to support the excavated slope along the road to improve the stability of the excavated slope, so as to ensure the operation safety of the road
Some studies have established some physical models [18,19,20,21] and expounded the phenomenon of prestress loss of anchor cable in multiple directions through theoretical analysis. These models generally believe that the long-term loss of anchor cable prestress is mainly related to the creep of reinforced rock mass, under the long-term action of the tensioning load of the anchor cable, creep deformation occurs in rock mass, which causes the rebound shrinkage of anchor cable, and causes the long-term loss of anchor cable prestress
These models only build physical models of anchor cable and rock mass, and ignore the role of frame beam in anchored slope, the establishment of the prestress loss model of anchor cable is based on the assumption that the rock mass is uniformly stressed and the frame beam is the guarantee of uniform stress of rock mass in anchored slope, the role of frame beam should not be ignored in the physical modeling of prestress loss of anchor cable
Summary
During the construction of highways and railways, slope excavation will change the original stress state of a slope, and accelerate the weathering speed of new exposed rock mass [1,2,3,4]; it is necessary to support the excavated slope along the road to improve the stability of the excavated slope, so as to ensure the operation safety of the road. Some studies have established some physical models [18,19,20,21] and expounded the phenomenon of prestress loss of anchor cable in multiple directions through theoretical analysis. These models generally believe that the long-term loss of anchor cable prestress is mainly related to the creep of reinforced rock mass, under the long-term action of the tensioning load of the anchor cable, creep deformation occurs in rock mass, which causes the rebound shrinkage of anchor cable, and causes the long-term loss of anchor cable prestress.
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