Thursday 16 June 2016

Loess in Britain VIII The Ospringe Project

The Ospringe project was a NERC-funded study of the nature of the soil structure collapse phenomenon in loess ground [the process sometimes known as hydroconsolidation or hydrocollapse]. It started at the Windy Day meeting at Nottingham Trent University on the 2nd April 1997.  The initial structure of the project was sketched out on the same day, on the train from Nottingham to Leicester. It eventually involved several universities (Loughborough, Leicester, Nottingham Trent) and the British Geological Survey at Keyworth.  It eventually ended in 2015 with the publication of the 'mineralogy & fabric' paper.

Milodowski, A.E.,  Northmore, K.J.,  Kemp, S.J.,  Entwisle, D.C.,  Gunn, D.A.,  Jackson, P.D.,  Boardman, D. I.,  Zoumpakis, A.,  Rogers, C.D.F.,  Dixon, N.,  Jefferson, I.,  Smalley, I.J., Clarke, M.   2015.  The mineralogy and fabric of 'Brickearth'  in Kent, UK and their relationship to engineering behaviour.  Bulletin of Engineering Geology and the Environment  74,  1187-1211

In this detailed paper you can find a very satisfactory explanation of the mechanism of hydroconsolidation- which in effect shows how the metastable loess deposit formed by aeolian  deposition takes on the property of collapsibility which allows hydroconsolidation to happen, and may lead to subsidence in some situations. Note the separation of metastability and collapsibility, and the assigning of separate causes. The development of collapsibility might be thought of as an aspect of loessification- this was discussed by Smalley & Markovic(2014)- a spin-off from Milodowski et al (2015) which actually appeared before the key paper was published.

Smalley, I.J., Markovic, S.B.  2014.  Loessification and hydroconsolidation:  there is a connection.  Catena 117,  94-99. 


Zourmpakis, A., Boardman, D.I.,  Rogers, C.D.F., Jefferson, I.,  Gunn, D.A.,  Jackson, P.D.,  Northmore, K.J.,  Entwisle, D.C.,  Nelder, L.M., Dixon, N.  2006.  Case study of a loess collapse field trial in Kent, SE England.  Quarterly Journal of Engineering Geology and Hydrogeology 39, 131-150

"..  a field trial of hydrocollapse in loessic  brickearth deposits.  The site chosen was a working quarry used as a source of brickearth for the local brickworks at Ospringe, just east of the town of Faversham.


 
 
 
 

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