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  4. An experimental study of the influence of pore water on dynamic rupture processes
 
conference poster not in proceedings

An experimental study of the influence of pore water on dynamic rupture processes

Acosta, Mateo  
•
Passelègue, F.
•
Schubnel, A.
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2016
Gordon Research Conference in Rock Deformation.

The objective is to examine the influence of pore water on dynamic rupture processes in the context of deep geothermal reservoirs. We conducted stick slip experiments on thermally-treated, saw-cut westerly granite samples under triaxial . The samples were widely instrumented to allow measuring dynamic shear stress drops, temperature increases and acoustic emissions. Preliminary results showed that at a given effective confining pressure (Pc-pf), the dynamic shear stress drops were about 20 to 30% higher and slip distances were about 30 to 40% longer in dry samples than in water saturated samples. Following the same tendency, higher temperature elevations were recorded during nominally dry experiments. These results highlight the importance of pore water pressure in controlling dynamic frictional weakening, and suggest that water might inhibit dynamic weakening and so, rupture propagation in granitic rocks.

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Type
conference poster not in proceedings
Author(s)
Acosta, Mateo  
Passelègue, F.
Schubnel, A.
Violay, Marie  
Date Issued

2016

Written at

EPFL

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LEMR  
Event nameEvent placeEvent date
Gordon Research Conference in Rock Deformation.

Andover, New Hampshire, USA

August 20 -25, 2016

Available on Infoscience
September 6, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/129110
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