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Investigation of block foundations resting on soil-rock and rock-rock media under coupled vibrations

Journal of Rock Mechanics and Geotechnical Engineering 2017年第2期9卷 305-317页

作者： Renuka Darshyamkar Ankesh Kumar Bappaditya Manna Department of Civil Engineering Indian Institute of Technology DelhiHauz KhasNew Delhi110016India

In the present study,the dynamic response of block foundations of different equivalent radius to mass（R;/m） ratios under coupled vibrations is investigated for various homogeneous and layered *** frequency-dependent stiffness and damping of foundation resting on homogeneous soils and rocks are determined using the half-space *** dynamic response characteristics of foundation resting on the layered system considering rock-rock combination are evaluated using finite element program with transmitting *** versus amplitude responses of block foundation are obtained for both translational and rotational motion.A new methodology is proposed for determination of dynamic response of block foundations resting on soil-rock and weathered rock-rock system in the form of equations and *** variations of dimensionless natural frequency and dimensionless resonant amplitude with shear wave velocity ratio are investigated for different thicknesses of top soil/weathered rock *** dynamic behaviors of block foundations are also analyzed for different rock-rock systems by considering sandstone,shale and limestone underlain by *** variations of stiffness,damping and amplitudes of block foundations with frequency are shown in this study for various rock—rock *** the analysis,two resonant peaks are observed at two different frequencies for both translational and rotational *** is observed that the dimensionless resonant amplitudes decrease and natural frequencies increase with increase in shear wave velocity ***,the parametric study is performed for block foundations with dimensions of 4 m × 3 m × 2 m and 8m×5m×2m by using generalized *** variations of natural frequency and peak displacement amplitude are also studied for different top layer thicknesses and eccentric moments.

关键词： Rock-rock system Block foundation Coupled vibration homogeneous medium Equivalent radius to mass ratio Half-space theory

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