Application of 4-D resistivity imaging technique to visualize the migration of injected materials in subsurface
DC resistivity monitoring has been increasingly used in order to understand the changes of subsurface conditions in terms of conductivity.The commonly adopted interpretation approach which separately inverts time-lapse data may generate inversion artifacts due to measurement error.Eventually the contaminated error amplifies the artifacts when reconstructing the difference images to quantitatively estimate the change of ground condition.In order to alleviate the problems,we defined the subsurface structure as four dimensional (4-D) space-time model and developed 4-D inversion algorithm which can calculate the reasonable subsurface structure continuously changing in time even when the material properties change during data measurements.In this paper,we discussed two case histories of resistivity monitoring to study the ground condition change when the properties of the subsurface material were artificially altered by injecting conductive materials into the ground: ① dye tracer experiment to study the applicability of electrical resistivity tomography to monitoring of water movement in soil profile and ② the evaluation of cement grouting performed to reinforce the ground.Through these two case histories,we demonstrated that the 4-D resistivity imaging technique is very powerful to precisely delineate the change of ground condition.Particularly owing to the 4-D inversion algorithm,we were able to reconstruct the history of the change of subsurface material property.
resistivity monitoring 4-D inversion dye tracer experiment grouting effect
Jung-Ho Kim Myeong-Jong Yi Sam-Gyu Park
Geoelectric Imaging Laboratory,Korea Institute of Geoscience and Mineral Resources,Korea
国际会议
The 3rd International Conference on Environmental and Engineering Geophysics(第三届环境与工程地球物理国际会议)
武汉
英文
272-281
2008-06-15（万方平台首次上网日期，不代表论文的发表时间）