数值模拟在黑山峡两坝址构造稳定性评价中的应用
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摘要
通过对黑山峡进行区域应力场三维有限元模拟 ,利用岩石破裂危险度KR及断层滑动危险系数KF两个判别指标 ,确定出中卫—同心活动断裂带弧形顶点部位红谷梁—石圈区段及海原活动断裂带上西华山以东区段两个未来地震危险区 ,震源均处于上、中地壳交接带 ,即深 1 5km左右 ,可能发生的最大地震震级分别为MS7 3级及MS8 2级。地震对两坝址的影响表明 ,大柳树坝址所受影响烈度可达 9度 ,且位于极震区内 ,构造稳定性差 ;小观音坝址所受影响烈度约为 7度 ,构造稳定性相对较好。
By 3-D finite element simulation of the zone tectonic stress in Heishan Gorge, two future seismic dangerous areas were determined using rock rupture risk coefficient (KR) and fault gliding risk coefficient (KF) as criteria, which were located in the arc apex from Honggulian to Shijuan in Zhongwei-Tongxin active faults and the part east to Xihua mountain in Haiyuan active fault with epicenter depth of about 15Km and magnitude of M S7.3 and M S8.2 individually. The influence of the potential earthquake to the two dam-sites in Heishan Gorge shows that the Daliushu dam-site's influenced intensity can get to IX and the dam-site is in the meizoseismal area, which is unstable in tectonics, and the Xiaoguanyin dam-site's influenced intensity is about 7, which is comparatively stable in tectonics.
By 3-D finite element simulation of the zone tectonic stress in Heishan Gorge, two future seismic dangerous areas were determined using rock rupture risk coefficient (KR) and fault gliding risk coefficient (KF) as criteria, which were located in the arc apex from Honggulian to Shijuan in Zhongwei-Tongxin active faults and the part east to Xihua mountain in Haiyuan active fault with epicenter depth of about 15Km and magnitude of M S7.3 and M S8.2 individually. The influence of the potential earthquake to the two dam-sites in Heishan Gorge shows that the Daliushu dam-site's influenced intensity can get to IX and the dam-site is in the meizoseismal area, which is unstable in tectonics, and the Xiaoguanyin dam-site's influenced intensity is about 7, which is comparatively stable in tectonics.
引文
[1]杨斌,王爱国,周俊喜,等黄河黑山峡大柳树与小观音两坝址构造稳定性对比研究报告[R]甘肃省地震局兰州地震工程院,2002
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[3]薛宏运.鄂尔多斯地块周围的现代地壳应力场[J].地球物理学报,1984,27(2):144-152.
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[2]李步云,杨斌,刘洪春,等三维有限元数值模拟在宁夏大坝电厂地震安全性评价中的应用[J]西北地震学报,1995,17(3):80-87.
[3]薛宏运.鄂尔多斯地块周围的现代地壳应力场[J].地球物理学报,1984,27(2):144-152.
[4]庄培仁,常志忠.断裂构造研究[M].北京:地震出版社,1996.
[5]ByerleeJ .Frictionofrocks[J].PureandAppliedGeophysics.1978,116(4/5):615-625.
[6]王仁,何国琦.华北地区地震迁移规律的数学模拟[J].地震学报,1980,2(2):32-41.
[7]陈.地壳岩石的力学性能-理论基础与实验方法[M].北京:地震出版社,1988.
[8]郭增建,秦保燕.震源物理[M].北京:地震出版社,1979.
[9]徐知纶.弹性力学(上)[M].北京:高等教育出版社,1990.
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