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Title: Effectiveness of granular columns for containing settlement of foundations supported on soft clay
Author: Moorhead, Mary Catherine
Awarding Body: Queen's University Belfast
Current Institution: Queen's University Belfast
Date of Award: 2013
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Abstract:
This thesis reports the findings of laboratory based investigations into the settlement behaviour of granular columns with respect to time, in particular the progression through initial, consolidation and creep settlements. The aim of the research is to investigate and segregate the three settlement stages of a raft and an isolated foundation, supported by soft clay improved by granular columns. For convenience, the programme of work is divided into two parts, in which : Part 1 examines the long term settlement performance of a smooth, rigid raft underlain by soft clay without granular columns, and with granular columns, under single and multiple configurations, at an area replacement ratio, As of 15%; and Part 2 examines the long term settlement performance of an isolated footing underlain by soft clay without granular column and with a single granular column at an As of 33%. The results obtained from Part 1 (raft foundation loading) of the experimental investigations challenge the effectiveness of granular columns to control foundation settlement over a prolonged period, when installed in soft clay under a range of loadings. The tests were carried out in instrumented, one dimensional testing chambers on samples (254 mm ɸ, 100 mm high) of kaolin and sleech . The results obtained from Part 2 (isolated foundation loading) of the experimental investigations suggest that granular columns are a viable option in reducing settlements (initial, consolidation and creep) in weak deposit under low bearing pressures, at which the soil is overconsolidated, and not particularly effective under moderate to high bearing pressures, at which the soil is normally consolidated. The tests were carried out in instrumented, three dimensional testing chambers on samples (300 mm ɸ, 400 mm high) of kaolin and sleech.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.602683  DOI: Not available
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