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UBC Theses and Dissertations

Vibrations in soil with special regard to foundation design : a review of current theories with experimental work in clay settlements Forrest, James Benjamin


It is the purpose of this thesis to review, and to evaluate to a degree, some of the current theories dealing with the effects of vibrations on foundations in contact with the earth. Basic parameters, the means of evaluating them, and their applications are discussed. Conditions leading to vibration and shock problems, the significance of these problems and various correctional methods are presented. The effects of vibrations on foundations, with particular regard to settlement, are considered by means of modifications to the soil characteristics as observed by other writers. Long term consolidation tests were carried out on undisturbed and remolded clay samples, both vibrated and unvibrated. These tests were conducted in order to secure a comparison between actual test results and the conclusions given by the above theory, for what may be considered an extreme case. Cohesive soil is known to be much less sensitive to vibration than cohesionless soil, thus very little work has been done on it in this regard. The degree of independence of cohesionless soil to vibration was investigated within the limits of these tests.

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