Soil Amplification Studies for Typical Soil Profiles in the Boston Area, Optimum Seismic Protection for New Building Construction in Eastern Metropolitan Areas

摘要

The first section of this report describes the criteria used in the selection of typical profiles in the Boston Basin for preliminary soil amplification analysis. Selection from literature studies of typical soil profiles were chosen to correlate the dynamic response of such profiles on the basis of their fundamental periods. Of particular importance are deep profiles which include clay. Specific questions are clarified and investigated through preliminary analysis. Points needing clarification are: how variation of thickness of the profile affects response; how variation of shear modulus for the same profile influence prediction; how the nature of the top layer affects results for the several types of profiles; and how considering or ignoring the flexibility of the shale and weathered rock layers underlying the clay and of the bedrock affect the results. The second section of this report summarizes the conclusions of these studies; presents the model selected for the production amplification studies; and describes the results for many typical profiles.