雅砻江锦屏水电工程区域稳定性探讨

从地震地质的观点出发,探讨流域的地震稳定性,着眼于锦屏一级、二级水电站枢纽区的地震地质条件、历史地震情况,强震带的分布与地震活动情况,进一步讨论锦屏水电工程的区域稳定性。分析了施工期间横跨锦屏山的2条锦屏辅助交通洞施工揭露的锦屏山断裂与锦屏一级坝址区地下洞室和边坡开挖揭示的f13、f14、f5、f8及F1断层,其性状未超出预期,无新构造活动迹象,锦屏一级、锦屏二级水电站区域稳定。

DISCUSSIONS OF EARTHQUAKE STABILITY OF JINPING HYDROELECTRICITY ENGINEERING ON YALONGJIANG RIVER

This paper embarks from the earthquake geology viewpoint and discusses the earthquake stability of the catchment basin of Jin Ping Hydroelectricity Engineering on Yalongjiang River. The paper focuses on the seismic geologic condition, the historical earthquake situation, the pleistoseismic zone distribution and the seismic activity situation at the key areas of the Jinping I and Jinping II hydroelectric power stations. It further discusses the regional stability of the Jinping hydroelectricity project. The geologic conditions during the construction period are further analyzed. They include the Jin Ping fault discovered from two assistance transportation tunnels across the Jinping mountain and the faults f13, f14, f5, f8 and the fault F1 at the dam sites of Jinping I discovered from both tunnel excavations and slope excavations. The characteristics of the faults were in some expected conditions. The faults did not show any active signs. This paper therefore concludes the Jinping Ⅰ and Jinping Ⅱ hydroelectricity project is earthquake stable and should maintain invariability.