DEFORMATION AND RESEARCH OF PRESTRESSED ANCHORING ON ROCK SLOPES OF TGP

摘要

Based on the construction and monitoring results of anchor cables in the situ of the Three Gorges, the paper demonstrates the change process and characteristics of the anchoring prestress, puts forward the influencing factors and reasons of causing the prestress changes. The change process of the anchoring prestress can be described as following three stages: First, rapid drop stage of the anchoring prestress; Second, fluctuation stage of the anchor prestress; Third, stable change stage of the anchoring prestress. For the rock mass with many joints and cracks, rainfall and its lasting time have an enormous influence on the anchoring prestress. The influence will not happen immediately after the rainfall, but has a time lag. But after several days, with the disappearance of the water, the increased stress will disappear gradually, the anchorage prestress will basically recover to its initial state. The measuring results show that when one anchor cable is strained, the prestress of the nearby cables becomes small. These indicate that the anchor cables influence each other while strained.