大柳树高土石坝工程场地抗震安全性研究
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摘要
黄河黑山峡河段一级开发大柳树高土石坝,坝址距F201发震活断层仅1.5km,且位于断层上盘。坝址区地震动参数值高,建筑物场地类别上属于危险地段。工程建成后,存在水库诱发地震引起次级断层位错而导致建筑物破坏的工程抗断风险;存在大范围松动岩体浸水后在外加地震力作用下的边坡失稳、坝体开裂、隧洞错断等变形破坏的风险。即使采取多种重大工程措施,花费巨大资金进行处理,以防止此变形破坏,也很难保证工程的安全可靠。因此,根据国家强制性标准,应采取安全避让方针,不宜选此坝址为高坝坝址。
The Daliushu hydropower project is an earth-rockfill dam with one-stage development on the Heishanxia reach of Yellow River. The dam site is only 1.5 km away from the causality active fault (F_(201)), and it is located on the hanging wall of the fault. The dynamic earthquake parameters are high in the damsite region and the structural areas belong to the category of dangerous zone. Upon completion of the project, there exist not only breaking-resistance risk resulting secondary fault displacement from induced earthquakes to cause damages in the structures, but also deformed failure risks (unstable slope, cracked dam, faulted tunnel etc.) under additional seismic force within a large range of immersed loose rock mass. It is very difficult to guarantee the safety of project even if some important engineering measures are to be adopted, and late treatment is done with a great amount of cost to avoid such deformation damage. So, on the basis of the national mandatory standard, it is not suitable to select this site for the construction of high dam.
The Daliushu hydropower project is an earth-rockfill dam with one-stage development on the Heishanxia reach of Yellow River. The dam site is only 1.5 km away from the causality active fault (F_(201)), and it is located on the hanging wall of the fault. The dynamic earthquake parameters are high in the damsite region and the structural areas belong to the category of dangerous zone. Upon completion of the project, there exist not only breaking-resistance risk resulting secondary fault displacement from induced earthquakes to cause damages in the structures, but also deformed failure risks (unstable slope, cracked dam, faulted tunnel etc.) under additional seismic force within a large range of immersed loose rock mass. It is very difficult to guarantee the safety of project even if some important engineering measures are to be adopted, and late treatment is done with a great amount of cost to avoid such deformation damage. So, on the basis of the national mandatory standard, it is not suitable to select this site for the construction of high dam.
引文
[1] 国家地震局分析预报中心.黄河黑山峡河段主要断裂活动及大柳树坝址地震危险性分析报告[R].北京:国家地震局分析预报中心,1991.
[2] 兰州地震研究院.黄河黑山峡大柳树坝址及小观音坝址区域构造稳定性研究报告[R].兰州:兰州地震研究院,2002.
[3] 彭建兵,毛彦龙,范文,韩文峰,等.区域稳定动力学研究-黄河黑山峡水电工程例析[M].北京:科学出版社,2001.
[4] GB5001-2001,建筑抗震设计规范[S].
[5] DL5073-2000,水工建筑物抗震设计规范[S].
[6] 水利水电规划设计总院.碾压式土石坝设计手册[M].北京:能源部与水利部,1989.
[2] 兰州地震研究院.黄河黑山峡大柳树坝址及小观音坝址区域构造稳定性研究报告[R].兰州:兰州地震研究院,2002.
[3] 彭建兵,毛彦龙,范文,韩文峰,等.区域稳定动力学研究-黄河黑山峡水电工程例析[M].北京:科学出版社,2001.
[4] GB5001-2001,建筑抗震设计规范[S].
[5] DL5073-2000,水工建筑物抗震设计规范[S].
[6] 水利水电规划设计总院.碾压式土石坝设计手册[M].北京:能源部与水利部,1989.
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