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SUMMARY:G I TAYLOR LECTURE - Fracking - shale gas extraction and protectin
 g buildings from tunnelling subsidence - Professor Lord Mair  CBE FREng FR
 S\, Sir Kirby Laing Professor of Civil Engineering\, Head of Civil and Env
 ironmental Engineering\, Department of Engineering
DTSTART:20160208T180000Z
DTEND:20160208T190000Z
UID:TALK63109@talks.cam.ac.uk
CONTACT:Beverley Larner
DESCRIPTION:Fracking for shale gas extraction has been the subject of inte
 nse debate. Many myths\, mistruths and misunderstandings abound – freque
 ntly fuelled by the media – but there are also understandable concerns. 
 Most of these concerns have arisen from experiences in the USA where more 
 than 30\,000 shale gas wells have been drilled in recent years\, resulting
  in their ‘shale gas revolution’. The key questions are (a) what are t
 he risks of earthquakes? (b) what are the environmental risks\, particular
 ly in relation to possible groundwater contamination? The lecture will add
 ress these and other issues considered in the report for the UK Government
  by the Royal Society and the Royal Academy of Engineering. \n\nThe techni
 que of fracking – better known as hydraulic fracturing – is also used 
 for controlling settlements in soils induced by tunnelling and excavations
 \, particularly in relation to limiting damage to potentially affected bui
 ldings. The lecture will describe the technique of compensation grouting\,
  which involves controlled hydraulic fracturing of the ground\; this is ac
 hieved by injection of liquid grout from tubes installed between the tunne
 l and building foundations to compensate for ground loss and stress relief
  caused by the tunnel excavation. The technique was used very successfully
  to protect the Big Ben during construction of the Jubilee Line Extension 
 and is now widely adopted around the world\; it has been used extensively 
 to protect many buildings during the recent construction of Crossrail in L
 ondon. \n
LOCATION:Bristol-Myers-Squibb Lecture theatre\, Department of Chemistry
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