The duration and remediation technologies of anchorage structure applied to the landslide prevention and control along the highway of Tibet

The prestressed anchorage has been a common engineering technology for landslide prevention and mitigation along the highway in Tibet. Due to special geological and geomorphical environment and climate condition, the durability problem is prone to occur in prestressed anchorage. Based on the investigation of the prestressed anchorage engineering project applied to landslide along the highway in Tibet, the authors have classified the durability problems into three sorts, i.e., ①anchor seal failure; ②frame beam cavitation destruction; ③anchor cable failure because of partial deformation of the sliding slope. On the basis of ananalysis of the key factors that impact the duration of anchorage structure, three remediation and reinforcement technologies have been put forward, i.e., the remediation and reinforcement technology applied in the seal of anchorage structure failure and anchor head damage, the remediation and reinforcement technology applied in the prestressed anchorage cable and frame beam, and the technology applied in the supplement of prestress to improve the anti-sliding force of anchorage structure.