Seismic Response of Soil Deposits Underlain by Sloping Rock Boundaries

by Houshang Dezfulian, (A.M.ASCE), Asst. Prof. of Civ. Engrg.; Univ. of Tehran, Tehran, Iran,
H. Bolton Seed, (M.ASCE), Prof. of Civ. Engrg.; Univ. of California, Berkeley, CA,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1970, Vol. 96, Issue 6, Pg. 1893-1916

Document Type: Journal Paper


The finite element method of analysis provides a powerful tool for analyzing the response of soil deposits underlain by sloping rock boundaries. As it is customarily used, however, the mode superposition procedure for applying this analysis does not take into account the variability in the damping ratio associated with different regions of a soil deposit. Procedures are described which attempt to compensate for this shortcoming of the method. Analytical results are presented to show the influence of the inclination of the rock surface, the thickness of the soil deposit and the configuration of the deposit on the ground surface response for a range of soil types. It is shown that while the magnitude of the ground surface response in the vicinity of a sloping rock surface may be significantly influenced by the presence of the slope, the frequency characteristics are only slightly affected. Conclusions are presented concerning the effects of sloping rock surfces on the directional ground surface accelerations in adjacent soil deposits.

Subject Headings: Soil analysis | Slopes | Finite element method | Rocks | Seismic tests | Seismic effects | Boundary element method | Domain boundary

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