The reservoir bank of the Three Gorges reservoir is mainly composed of hard rock and semi hard rock, with few large faults and weak neotectonic movement and seismic activity, so the overall stability of the reservoir bank is good. However, some landslides and collapses occurred on the bank slope of the Three Gorges River during the undercutting process of the Yangtze river bed, which is a key natural phenomenon in the river development process. It has happened in history and may continue to happen after the reservoir impoundment. It is found that there are 284 large-scale landslides and dangerous rocks with a total volume of about 3 billion cubic meters distributed on the bank slope of the reservoir area. Among them, there are 64 large-scale landslides with poor stability and possible instability after impoundment, with a total volume of 340 million cubic meters. Even if all the landslides fall into the reservoir, there is no substantial impact on the reservoir capacity and service life. In the reservoir section within 26 km from the dam, there is no large-scale sliding mass that may lose stability, so the possible bank sliding will not affect the safety of the pivotal buildings. After the impoundment of the Three Gorges reservoir, due to the elevation of water level and the increase of water depth, local landslides and collapses may occur on the reservoir bank, which will not affect the navigation of the channel. After the reservoir impoundment, the new and old towns and residents may be greatly affected by the local collapse of the reservoir bank. Therefore, it is necessary to pay full attention to the geological conditions for the location of new towns and concentrated residential areas, and at the same time, it is necessary to establish the monitoring and prediction work for the possible unstable landslides.
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