# Solution3 - MIDDLE EAST TECHNICAL UNIVERSITY DEPARTMENT OF...

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CE 728 GEOTECHNICAL EARTHQUAKE ENGINEERING ASSIGNMENT #3 DYNAMIC SOIL PROPERTIES 09.11.2001 MIDDLE EAST TECHNICAL UNIVERSITY DEPARTMENT OF CIVIL ENGINEERING Modulus Degradation Plot vs. Shear Strain for Sands & Gravels 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1 0,0001 0,001 0,01 0,1 1 10 Cyclic Shear Strain (%) G/Gmax 1<s'm<3 Gravel (Average)

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ANIL YUNATCI 1213701 TABLE OF CONTENTS TABLE OF CONTENTS……………………………………………………………1 INTRODUCTION……………………………………………………………………. 2 DIGITIZATION OF THE CURVES…………………………………………. . 2 ESTIMATION OF DAMPING CURVE FOR GRAVEL………………… 2 ESTIMATING DYNAMIC SOIL PROPERTIES FOR THE  GIVEN SOIL PROFILE…………………………………………………………… 5 G max  AND CORRESPONDING V S  CALCULATION……………….5 ESTIMATION OF MODULUS DEGRADATION CURVE………. .6 ESTIMATION OF DAMPING CURVE…………………………………. 7 LIST OF REFERENCES……………………………………………………………7 APPENDIX1…………………………………………………………………………….8 APPENDIX 2………………………………………………………… ………………. 10 ii
1. INTRODUCTION Following curves regarding dynamic soil properties are readily available: 1. Modulus degradation curves for sands under different mean effective stresses and  average for gravels by  Seed et al.(1984). iii

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2. Damping curves for sands under different mean effective stresses by   Seed and  Idriss (1970). 3. Modulus degradation curves for cohesive soils, differentiated by their plasticity index  PI, by  4. Damping curves for cohesive soils, differentiated by their plasticity index PI, by  First aim is to predict the damping curve for gravels by  using Seed et al. (1984)  and   plots. To explain briefly, modulus degradation plot of sand (1< σ m <3) is  carried to damping plot by using the relation presented in   Then, this  plot is compared with the readily available damping curve for that material. The ratio of values on  the two plots for sand are evaluated, then this correction is applied to the gravel curve carried to  the damping plot. This curve is then refined, to meet the desired damping curve for sand. Second   part  of  the  problem   presents   a   soil   layers   of   which  some   properties  are  evaluated. Using these data, G max   and corresponding V s   value of the soil layer is calculated.  Corresponding curves for the known properties of soil for both modulus degradation and damping
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Solution3 - MIDDLE EAST TECHNICAL UNIVERSITY DEPARTMENT OF...

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