The Bhuj, India, earthquake: lessons learned for earthquake safety of dams on alluvium

被引:35
作者
Krinitzsky, EL [1 ]
Hynes, ME [1 ]
机构
[1] USA, Corps Engineers, Geotech & Struct Lab, Waterways Expt Stn,Engn Res & Dev Ctr, Vicksburg, MS 39180 USA
关键词
Bhuj; India; dams; earthquake; alluvium; foundations; soil liquefaction; Kachchh;
D O I
10.1016/S0013-7952(02)00049-2
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The Bhuj, India, earthquake of 26 January 2001, M-s 7.9, caused dams built on alluvium to sustain damage ranging from cosmetic to severe. Major damage was caused almost entirely by soil liquefaction in the alluvium. The critical factor was the level of earthquake ground motion. The Bhuj earthquake showed that peak horizontal accelerations (PHAs) less than or equal to 0.2 g were generally safe. PHAs > 0.2 g were hazardous, when unconsolidated granular foundation soils were water saturated. N values of < 20 are indicative of susceptibility to soil liquefaction. The Bhuj experience showed that alluvial foundation soils, subject to a PHA>0.2 g, must be evaluated over the full area beneath a new dam and all soils deemed susceptible to liquefaction must be either removed or treated. For remediating an old dam, reliable options are removal and replacement of liquefiable alluvium beneath upstream and downstream portions of the dam, combined with building berms designed to provide stability for the dam should there be a strength loss in soils beneath the dam. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:163 / 196
页数:34
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