长江三峡工程重大地质与地震问题研究主要成果综述

SUMMARY OF MAIN ACHIEVEMENTS OF STUDY ON IMPORTANT GEOLOGICAL AND SEISMOLOGICAL PROBLEMS IN SANXIA GORGES OF CHANGJIANG RIVER

本文简要综述了长江三峡工程中有关坝区及外围地壳稳定性、坝基和高边坡岩体工程、水库诱发地震、库岸稳定性及水库其他环境地质问题等重大工程与地震问题研究的成果。

The study on the important geological and seismological problems in Sanxia Gorges of Changjiang River is one of the national scientific and technical key projects during the Seventh Five -Year plan period. This paper gives a summary to the main research achievements on crustal stability of the dam area and its periphery, problem of dam foundation and high -angle slope rock mass engineering, the earthquake induced by reservoir filling, bank stability of reservoir and other environmental geological problems. In Sanxia project area, crustal stability is good, the dam area and dam location fall into the week seimic and microseismic environment.The area is located in the low seismic intensity area (Ⅰ0<Ⅵ). The bedrock in the dam location is hard and intact, It is possible that the construction plane of dam foundation and digging slope of the high-angle slope can be heightened further.The possibility of reservoir-induced earthquake is existed, but it is predicted that its influence on dam location is lower than (Ⅰ0<Ⅵ). The bank stability of the reservoir is basically stable, now and after reservoir filling, some landslide and rockfall activities are possible, but its influence on Sanxia project is not large. The losses of the reservoir-inundated mineral resources and its influence on hydrogeological environment of lower river are not large, the silt problem can be soluted. The mutual influence between the city and town move in the reservoir area and other emigration project and environmental geology must be valued, but it will not affect the project's strategic decision. In brief, the geologic and seismic conditions of Sanxia project is fine.