solution7 - CE 728 Geotechnical Earthquake Engineering...

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S u =350 kPa S u =200 kPa h=40 W=18000 kN/m CE 728 Geotechnical Earthquake Engineering Department of Civil Engineering Middle East Technical University, Ankara,Turkey Assoc. Prof. Dr. K. Önder Çetin ASSIGNMENT 7 Seismic Slope Stability 1. By using Makdisi and Seed (1978) simplified procedure, estimate seismically- induced embankment deformations due to an earthquake of moment magnitude M w =7.5, which was predicted to produce a crest acceleration of 0.8 g at the below shown 40 m high homogeneous earthfill dam. Not to scale i. Reduce d undrained shear strengths of embankment material is calculated as follows: kPa s kPa s u u 280 350 * 8 . 0 160 200 * 8 . 0 2 , 1 , = = = = ii. Resisting and disturbing moments should be calculated for determination of F.S. = dis res M M S F . . m kNm M res / 796394 65 * ) 360 30 * 65 * * 2 ( * 280 ) 360 15 * 65 * * 2 ( * 160 = + = π + = 40 * * 18000 33 * 18000 k M dis For FS=1.0, y k k = In this case, 28 . 0 = y k For 75 . 0 40 30 = = h y and a max =0.8g, 45 . 0 max max a k (from average of all data plot). So k max =0.36 For 78 . 0 max = k k y and M w = 7.5, u ≈ 0.3 to 3 cm.
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solution7 - CE 728 Geotechnical Earthquake Engineering...

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