scholarly journals X-231A demonstration of in-situ remediation of DNAPL compounds in low permeability media by soil fracturing with thermally enhanced mass recovery or reactive barrier destruction

1998 ◽  
Author(s):  
R.L. Siegrist ◽  
K.S. Lowe ◽  
L.D. Murdoch ◽  
W.W. Slack ◽  
T.C. Houk
Keyword(s):  
Low Permeability ◽  
In Situ Remediation ◽  
Reactive Barrier ◽  
Mass Recovery

In-situ remediation of acid mine drainage using a permeable reactive barrier in Aznalcóllar (Sw Spain)

2011 ◽  
Vol 191 (1-3) ◽  
pp. 287-295 ◽  
Author(s):  
Oriol Gibert ◽  
Tobias Rötting ◽  
José Luis Cortina ◽  
Joan de Pablo ◽  
Carlos Ayora ◽  
...  
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Permeable Reactive Barrier ◽  
In Situ Remediation ◽  
Reactive Barrier ◽  
Sw Spain ◽  
Acid Mine

Laboratory studies on fracturing of low-permeability soils

2001 ◽  
Vol 38 (2) ◽  
pp. 303-315 ◽  
Author(s):  
Marolo C Alfaro ◽  
Ron CK Wong
Keyword(s):  
Injection Pressure ◽  
Horizontal Wells ◽  
Tensile Failure ◽  
Low Permeability ◽  
Test Results ◽  
In Situ Remediation ◽  
Initial Fracture ◽  
Initiation Pressure ◽  
Stress Contrast

Hydraulic and pneumatic fracturing have been used to improve the effectiveness of most in situ remediation methods for contaminated sites underlain with unfavorable low-permeability soils. This paper presents results of a laboratory experimental investigation to characterize the mechanisms related to the initiation pressure and growth of fractures stimulated from vertical and horizontal wells. The mechanisms of fracture in low-permeability soils appeared to be of a tensile failure mechanism enhanced by the generation of pore pressure as the soil around the well was being sheared due to the radial-tangential stress difference imposed by the injected pressure. The impacts of initial fracture slots on fracture orientation and initiation pressure were also investigated. The test results have demonstrated that the presence of initial fracture slots could reduce the injection pressure required to initiate fracture in the well. The initial slot, however, did not necessarily control the orientation of the propagating fracture. The effect of imposed stresses in the soil was evaluated also and was found to influence the orientation and propagation of fracture. Smaller stress contrast favored multiple deviated fractures, whereas larger stress contrast favored distinct fractures.Key words: soil fracturing, laboratory test, low-permeability soil, fracture propagation.

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