| 长江三峡工程坝区及外围地壳稳定性评价与分区研究 |
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| 关键词:crustal stability assessment and zonation Three Gorges Project tectonic zonation crustal stress field fuzzy mathematics relative stable state |
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| An Assessment and Zonation of Regional Crustal Stability in and around the Dam Region of the Three Gorges Project on the Yangtze River |
| The scale of the Three Gorges project(TGP) on the Yangtze River ensures it will have enormous social and economic consequences. Naturally, determining the safety of TGP is an essential consideration, and conducting the assessment and zonation of regional crustal stability has a crucial role on the success or failure of TGP in the future. In this paper, the regional crustal stability takes much emphasis on tectonic stability, coordinating with crustal surface medium conditions, and considering the stability of partial rock and soil masses and of surface slope involving landslides, collapses etc. related with fracture activity. The evaluation and zonation of regional crustal stability, in this paper, is conducted in two orders and scopes: the dam region and its vincinity of TGP(about 310000km2) and the near dam region of TGP(about 30000km2). On the bases of tectonic zonation and present crustal stress field analysis, using fuzzy mathematics to do quantitative and comprehensive evaluation of crustal stability, and combining with synthetic geological study, finally, the zonation of crustal stability is conducted. The results of the assessment and zonation of the larger region are that the general crustal stability of the dam region is in less stable - stable state and that the Sandouping dam site is on the relative stable land mass; the result of the smaller region is that the Sandouping dam site is on the ancient complete granitic body belonging to the stable(Ⅰ) land mass. Therefore, from the view of assessment and zonation regional crustal stability, it is due to construct a giant hydropower station at Sandouping. |
| SUN Ye,TAN Cheng-xuan,WANG Rui-jiang,HU Dao-gong.1996.An Assessment and Zonation of Regional Crustal Stability in and around the Dam Region of the Three Gorges Project on the Yangtze River[J].Acta Geoscientica Sinica,17(3):258-268. |
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