Imperial College London
Alternate

Dr Paula Alejandra Gago

Faculty of Engineering, Department of Earth Science & Engineering

 
 
 
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Contact

 

p.gago

 
 
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Location

 

Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Gago:2020:10.1103/PhysRevE.101.012907,
author = {Gago, P and King, P and Wieladek, K},
doi = {10.1103/PhysRevE.101.012907},
journal = {Physical Review E: Statistical, Nonlinear, and Soft Matter Physics},
pages = {012907--1--012907--6},
title = {Fluid-induced fracture into weakly consolidated sand: Impact of confining stress on initialization pressure},
url = {http://dx.doi.org/10.1103/PhysRevE.101.012907},
volume = {101},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - This paper studies the process of fluid injection driven fractures in granular packs where particles are held together by external confining stresses and weak intergrain cohesion. We investigate the process of fracture formations in soft sand confined into a radial Hele-Shaw cell. Two main regimes are well known for fluid injection in soft sand. For low fluid injection pressures it behaves as a solid porous material while for high enough injection pressures grain rearrangement takes place. Grain rearrangements lead to the formation of fluid channels or “fractures,” the structure and geometry of which depend on the material and fluid properties. Due to macroscopic grain displacements and the predominant role of dissipative frictional forces in granular system dynamics, these materials do not behave as conventional brittle, linear elastic materials and the transition between these two regimes cannot usually be described using poroelastic models. In this work we investigate the change in the minimum fluid pressure required to start grain mobilization as a function of the confining stresses applied to the system using a spatially resolved computational fluid dynamics–discrete element method numerical model. We show that this change is proportional to the applied stress when the confining stresses can be regarded as uniformly distributed among the particles in the system. A preliminary analytical expression for this change is presented.
AU  - Gago,P
AU  - King,P
AU  - Wieladek,K
DO  - 10.1103/PhysRevE.101.012907
EP  - 1
PY  - 2020///
SN  - 1539-3755
SP  - 012907
TI  - Fluid-induced fracture into weakly consolidated sand: Impact of confining stress on initialization pressure
T2  - Physical Review E: Statistical, Nonlinear, and Soft Matter Physics
UR  - http://dx.doi.org/10.1103/PhysRevE.101.012907
UR  - https://journals.aps.org/pre/abstract/10.1103/PhysRevE.101.012907
UR  - http://hdl.handle.net/10044/1/76774
VL  - 101
ER  -
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