Modification of Bouwer and Rice Method to Evaluate Hydraulic Conductivity of Cutoff Wall Considering Filter Cake Development

As a conventional line-fitting method, the Bouwer and Rice method has been popularly adopted to estimate the hydraulic conductivity of an aquifer through a slug test. Because a vertical cutoff wall is usually very compressible and features a small wall thickness, the Bouwer and Rice method should be carefully applied to analyzing slug test results to estimate the hydraulic conductivity of vertical cutoff walls. In addition, a relatively impermeable layer, called a filter cake, formed at the interface between the cutoff wall and the natural soil formation makes it difficult to use the Bouwer and Rice method directly. In order to overcome such limitations, the original Bouwer and Rice method has been modified by incorporating the concept of the flow net method. In this modification, the geometry condition of cutoff walls including the filter cake is effectively considered in evaluating the hydraulic conductivity of a vertical cutoff wall.

[1]  George M. Filz,et al.  Slug Test in Soil-Bentonite Cutoff Walls Using a Push-In Piezometer Tip , 2005 .

[2]  Jeremy Paul Britton.  Soil-Bentonite Cutoff Walls: Hydraulic Conductivity and Contaminant Transport , 2001 .

[3]  D. E. Daniel,et al.  Slug Test Analysis in Vertical Cutoff Walls. II: Applications , 2006 .

[4]  Jr . James J. Butler,et al.  Slug tests in site characterization; some practical considerations , 1996 .

[5]  Hangseok Choi.  Numerical Model for Analyzing Slug Tests in Vertical Cutoff Walls , 2007 .

[6]  J. J. Butler,et al.  The Design, Performance, and Analysis of Slug Tests , 1997 .

[7]  M. J. Hvorslev.  Time lag and soil permeability in ground-water observations , 1951 .

[8]  D. E. Daniel,et al.  Modified Fluid Loss Test as an Improved Measure of Hydraulic Conductivity for Bentonite , 2008 .

[9]  Samuel P. Clemence,et al.  In-Place Permeability Measurement of Slurry Trench Cutoff Walls , 1986 .

[10]  James J. Butler,et al.  Slug tests in partially penetrating wells , 1994 .

[11]  Hangseok Choi,et al.  Slug Test Analysis to Evaluate Permeability of Compressible Materials , 2008, Ground water.

[12]  H. Bouwer,et al.  A slug test for determining hydraulic conductivity of unconfined aquifers with completely or partially penetrating wells , 1976 .

[13]  D. J. Dappolonia.  Soil-Bentonite Slurry Trench Cutoffs , 1980 .

[14]  H. Bouwer.  The Bouwer and Rice Slug Test — An Updatea , 1989 .

[15]  George M. Filz,et al.  Formation and Properties of Bentonite Filter Cakes , 1998 .

[16]  D. E. Daniel,et al.  Slug test analysis in vertical cutoff walls. I: Analysis methods , 2006 .