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SUMMARY:Geomechnical study of hydrate-bearing sediments with turbidite for
 mation and hydrate heterogeneity - Mingliang (Carter) Zhou\, CUED
DTSTART:20141127T160000Z
DTEND:20141127T170000Z
UID:TALK54239@talks.cam.ac.uk
CONTACT:Anama Lowday
DESCRIPTION:The deformation processes of hydrate sediments during methane 
 gas production are complex due to the coupled thermo-hydro-mechanical (THM
 ) phenomena of deformation\, fluid flow\, heat flow and phase changes. Fro
 m a geotechnical perspective\, several potential geohazards may result fro
 m gas production: wellbore instability\; damages in well casing or support
 ing well infrastructure\; submarine landslide\; seafloor instability\; and
  seafloor subsidence. In order to investigate the mechanisms of these geoh
 azards occurring\, a cost effective method is to have numerical simulation
 s of the hydrate gas production. Hence\, it is essential to have accurate 
 numerical modelling of the geomechanical behaviour of the hydrate-bearing 
 sediments.\n\nThe Cambridge methane hydrates geomechanics simulator (CMHGC
 ) is a 2D thermo-hydro-mechanical coupled finite difference code developed
  at Cambridge using FLAC2D. Within this code\, a methane hydrate critical 
 state (MHCS) model was developed in order to capture the mechanical behavi
 or of hydrate-bearing sediments based on the Modified Cam-Clay model. The 
 developed MHCS model assumes the soil materials within one element are hom
 ogenous and present an isotropic response. For real site data\, we need to
  consider the site turbidite soil formation as well as the hydrate saturat
 ion heterogeneity within each element. Due to the limitations of the MHCS 
 model\, an anisotropic MHCS model was developed and implemented into ABAQU
 S UMAT. This developed Anisotropic-MHCS model can better describe the anis
 otropic feature of the turbidite formation\, which includes the fabric evo
 lving process during the hydrate dissociation. This evolving process repre
 sents the material changing from anisotropic heterogeneous system into an 
 isotropic homogeneous system. \n\nBy applying the AMHCS model\, an establi
 shed parameter calibration method was also developed to determine the upsc
 aled model parameters. To assess the performance of this upscaeld model\, 
 the geomechnical behaviors of hydrate bearing sediments from upscaled mode
 l simulation were investigated and compared to the results of simulations 
 with previous model. \n
LOCATION: Cambridge University Engineering Department\, Lecture Room 6
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