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Title: Experimental study of the geotechnical properties of UK mudrocks
Author: Hosseini Kamal, Ramtin
ISNI:       0000 0004 2718 337X
Awarding Body: Imperial College London
Current Institution: Imperial College London
Date of Award: 2012
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Quantifying soil characteristics using state of the art equipments is a necessary step in introducing comprehensive constitutive models which can be used in engineering design. Large areas of the Southern UK are covered by Triassic to Eocene mudrocks that were deposited in dissimilar geological environments, and have experienced diverse post depositional histories leading to a range of current natural structures. The aim of this study was to investigate different aspects of the mudrock’s structure and their implication on the mechanical behaviour of these soils. Three mudrocks were chosen and sampled; Oxford, Kimmeridge and Gault Clays. These were to be compared with London Clay which was previously studied at Imperial College by Gasparre (2005), Nishimura (2006) and Minh (2007). High quality block and rotary core samples obtained for these soils were used in two experimental studies carried out by the author and Brosse (2011) as well as for a micro-structure analysis performed by Wilkinson (2011). The author carried out series of tests using triaxial apparatus equipped with bender elements and high resolution displacement transducers. These tests provided the strength envelopes of each soil, undrained stiffness and drained elastic parameters. Oedometer cells were also used to investigate the 1-D compression of each material. These were complimented by ring shear tests and index tests performed on all four mudrocks. Findings of this study highlighted the highly anisotropic behaviour of these soils. No clear correlation was found to relate the anisotropy or any other characteristics of these materials to their geological age or their depth of burial. For Gault Clay, the effects of weathering and root action were investigated and the importance of highly fissured macro-structure of the soils was noted. The results from this study are in good agreement with those from tests carried out by Brosse (2011) using a hollow cylinder apparatus and the micro-analysis carried out by Wilkinson (2011).
Supervisor: Jardine, Richard Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral