scholarly journals In situ remediation of DNAPL compounds in low permeability media fate/transport, in situ control technologies, and risk reduction

1996 ◽  
Author(s):  
Keyword(s):  
Risk Reduction ◽  
Low Permeability ◽  
In Situ Remediation ◽  
In Situ Control ◽  
Control Technologies

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.

scholarly journals Permeation Dispersal of Treatment Agents for In Situ Remediation in Low Permeability Media: 1. Field Studies in Unconfined Test Cells

2000 ◽  
Author(s):  
R.L. Siegrist ◽  
D.R. Smuin ◽  
N.E. Korte ◽  
D.W. Greene ◽  
D.A. Pickering ◽  
...  
Keyword(s):  
Field Studies ◽  
Low Permeability ◽  
In Situ Remediation ◽  
Test Cells

Development of Simulators for In Situ Remediation Evaluation, Design, and Operation

2001 ◽  
Author(s):  
Mark S. Dortch ◽  
Christian J. McGrath ◽  
John J. Nitao ◽  
Mark A. Widdowson ◽  
Steve Yabusaki
Keyword(s):  
In Situ Remediation ◽  
Evaluation Design

In Situ Remediation of Explosives Contaminated Ground-Water with Sequential Reactive Treatment Zones

2001 ◽  
Author(s):  
Paul G. Tratnyek ◽  
Richard L. Johnson ◽  
Timothy L. Johnson ◽  
Rosemarie Miehr
Keyword(s):  
Ground Water ◽  
In Situ Remediation
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