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You searched for +publisher:"University of Saskatchewan" +contributor:("Gan, Julian"). Showing records 1 – 3 of 3 total matches.

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1. mukherjee, rahul. Consolidation and Arching Potential of Slurry Backfill.

Degree: 2012, University of Saskatchewan

Soil-bentonite (SB) slurry walls are one of the most popular techniques for minimizing the horizontal migration of contaminants. Backfill arching, or “hang-up” of the backfilled slurry, on the wall trench has the potential to significantly reduce the effectiveness of these barriers. This research was conducted to supplement the design and installation of an 11,000 m long slurry wall at PotashCorp’s mine in Rocanville, Saskatchewan. The slurry wall is being installed through low permeability glacial till containing permeable granular zones. This study was undertaken to improve the understanding of vertical stress distribution in these deep barriers. In particular, the objective of this study was to develop an understanding of the factors controlling arching and hydraulic conductivity (k) of SB walls. Slurry wall “hang-up” or arching is dependent on shear along the wall of the trench and on a coefficient of lateral earth pressure (K). Consolidated drained (CD) shear box tests were conducted to study the shear strength parameters of the backfill mixes. Six inch proctor mold was modified with load cells on the side walls to measure horizontal stresses along with consolidation. This was used to calculate coefficient of lateral earth pressure, K (which is the ratio of horizontal to vertical effective stress). The results of the laboratory testing program found that K was relatively independent of the percentage of fines present in the SB mix. It also showed that backfill angle of internal friction and k of the backfill decreased with increased fines content. The results of the laboratory testing program were used to model the vertical stress distribution in deep walls. An analytical model (discrete model) and a coupled seepage stress-strain finite element model (FEM) were used to predict vertical stress changes with time and depth for the different backfill materials. The primary conclusion of this research is that slurry wall backfill arching or “hang-up” significantly delays the magnitude and timing of vertical stress build-up in backfill. This loss of vertical stress results in backfill with lower density and higher hydraulic conductivity. The situation was found to be most critical for deep narrow slurry walls. Any advantage in using a coarser graded backfill was offset by higher backfill hydraulic conductivity. The net result is that the upper portions of slurry walls may not be able to achieve their hydraulic conductivity objectives as soon as expected, if at all. In addition, the backfill in the upper portion of the trench may be susceptible to chemical attack and osmotic consolidation. Construction of a 2 m high surcharge berm over the slurry wall was found to increase vertical effective stress and result in significantly lower (2 to 8 times) hydraulic conductivity values in the top 5 metres of the trench. The final hydraulic conductivity (k) at a depth of 5 m was approximately 75 % lower with a surcharge berm. Thus, construction of a surcharge berm over the slurry wall helps to satisfy the k requirement for SB… Advisors/Committee Members: Haug, Moir D., Barbour, Lee S., Gan, Julian, Hawkes, Christopher D., Fonsted, Terry.

Subjects/Keywords: Arching; Soil-Bentonite; Consolidation; Hydraulic conductivity

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APA (6th Edition):

mukherjee, r. (2012). Consolidation and Arching Potential of Slurry Backfill. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2012-12-922

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

mukherjee, rahul. “Consolidation and Arching Potential of Slurry Backfill.” 2012. Thesis, University of Saskatchewan. Accessed February 17, 2020. http://hdl.handle.net/10388/ETD-2012-12-922.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

mukherjee, rahul. “Consolidation and Arching Potential of Slurry Backfill.” 2012. Web. 17 Feb 2020.

Vancouver:

mukherjee r. Consolidation and Arching Potential of Slurry Backfill. [Internet] [Thesis]. University of Saskatchewan; 2012. [cited 2020 Feb 17]. Available from: http://hdl.handle.net/10388/ETD-2012-12-922.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

mukherjee r. Consolidation and Arching Potential of Slurry Backfill. [Thesis]. University of Saskatchewan; 2012. Available from: http://hdl.handle.net/10388/ETD-2012-12-922

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. Ebrahimi-Birang, Nader. The hydraulic behaviour of sand and silt soils around the residual-state condition.

Degree: 2012, University of Saskatchewan

Geotechnical and geo-environmental engineering problems may require the computation of near-ground-surface water balances. Evaluation of the unsaturated coefficient of permeability function is often necessary in order to undertake numerical simulations associated with the water balance evaluations. Evaporation at ground surface has the potential to reduce the water content of the soil to values less than the residual water content. However, it appears that the accuracy of commonly used methods for the determination of the permeability function around residual-state conditions is unknown. There may be lack of accuracy due to an oversimplification of the physics of water movement around the residual-state condition. Evaluation of the coefficient of permeability function around the residual-state condition requires reliable experimental data in the low water-content range. In this study, the concept of residual-state condition is reviewed, and a definition of the conditions suitable for geotechnical engineering practice is suggested. A transition zone for the soil-water content/soil-suction profile is defined for steady-state flow systems. A possible link between the limits of the transition zone and the residual-state condition is proposed. A method is developed for predicting the unsaturated coefficient of permeability, based on a new definition of the residual-state condition. The method is based on the theory of vapour-phase flow and on the soil-water characteristic curve. A series of evaporation tests were conducted in an environmentally controlled room on two different types of soil samples: sand and clayey silt. The unsaturated coefficient of permeability functions for the selected soils were established. The steady-state evaporation method used in this study proved to measure the unsaturated coefficient of permeability function in the low-water content range. The results obtained from the predictive method proposed in this thesis are compared to the experimental data and to the data predicted by the previously proposed methods. Predictions computed when using the new method appear to be more accurate than those from previously proposed methods. It was not possible to draw firm conclusions from the tests performed regarding the relationship between the residual-state condition and the upper and lower limits of the transition zone of the water-content/soil-suction profile. Advisors/Committee Members: Fredlund, Delwyn G., Barbour, S. L., Maule, Charles, Gan, Julian, Hawkes, Christopher D..

Subjects/Keywords: Unsaturated coefficient of permeability; unsaturated hydraulic conductivity; residual-state condition; soil-water characteristic curve; water retention curve; permeability function

…105 4.5.1.1 University of Saskatchewan Pressure Plate Cell (U of S Pressure Plate Cell… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Ebrahimi-Birang, N. (2012). The hydraulic behaviour of sand and silt soils around the residual-state condition. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2012-09-780

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Ebrahimi-Birang, Nader. “The hydraulic behaviour of sand and silt soils around the residual-state condition.” 2012. Thesis, University of Saskatchewan. Accessed February 17, 2020. http://hdl.handle.net/10388/ETD-2012-09-780.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Ebrahimi-Birang, Nader. “The hydraulic behaviour of sand and silt soils around the residual-state condition.” 2012. Web. 17 Feb 2020.

Vancouver:

Ebrahimi-Birang N. The hydraulic behaviour of sand and silt soils around the residual-state condition. [Internet] [Thesis]. University of Saskatchewan; 2012. [cited 2020 Feb 17]. Available from: http://hdl.handle.net/10388/ETD-2012-09-780.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ebrahimi-Birang N. The hydraulic behaviour of sand and silt soils around the residual-state condition. [Thesis]. University of Saskatchewan; 2012. Available from: http://hdl.handle.net/10388/ETD-2012-09-780

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of Saskatchewan

3. Jogi, Manoj. A method for measuring smooth geomembrane/soil interface shear behaviour under unsaturated conditions.

Degree: 2005, University of Saskatchewan

Geomembranes are one of the most widely used geosynthetics in various civil engineering applications. Their primary function is as a barrier to liquid or vapour flow. Smooth Geomembranes are frequently used in combination with different soils, and due to their low surface roughness, are challenging to design to ensure adequate shear strength along the smooth geomembrane-soil interface. It is important to use the appropriate values of interface shear strength parameters in the design of slopes incorporating one or more geomembranes in contact with soils. The parameters are determined by conducting direct shear test on the geomembrane-soil interface. Laboratory tests of interface shear strength for geomembranes and soil are typically carried out with no provision for measurement of pore pressures at the soil/geomembrane interface. This thesis deals with study of smooth geomembrane-soil interfaces, particularly under unsaturated conditions. The various factors that affect the interface shear behaviour are also studied. The tests were conducted using a modified direct shear box with a miniature pore pressure transducer installed adjacent to the surface of the geomembrane. Geomembrane–soil interface shear tests were carried out with continuous measurement of suction in close proximity to the interface during the shearing process thus making it possible to analyze test results in terms of effective stresses. The method was found to be suitable for unsaturated soils at low values of matric suction. Results of interface shear tests conducted using this method show that it is quite effective in evaluating interface shear behaviour between a geomembrane and an unsaturated soil. The results suggest that soil suction contributes to shearing resistance at low normal stress values. At lower normal stress values, the interface shear behaviour appears to be governed only by the magnitude of total normal stress. At high normal stresses, the failure mechanism changed from soil particles sliding at the surface of geomembrane to soil particles getting embedded into the geomembrane and plowing trenches along the direction of shear. A plowing failure mechanism resulted in the mobilization of significantly higher shear strength at the geomembrane soil interface. It was found that placement water contents near saturated conditions results in lower effective stresses, a shallower plowing mechanism and lower values of mobilized interface shear strength. Advisors/Committee Members: Fleming, Ian R., Sharma, Jitendra, Gan, Julian, Barbour, S. Lee, Sparling, Bruce F..

Subjects/Keywords: surface roughness; interface shear strength; pore-water pressure; unsaturated conditions; geomembrane

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Jogi, M. (2005). A method for measuring smooth geomembrane/soil interface shear behaviour under unsaturated conditions. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-12122005-150824

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Jogi, Manoj. “A method for measuring smooth geomembrane/soil interface shear behaviour under unsaturated conditions.” 2005. Thesis, University of Saskatchewan. Accessed February 17, 2020. http://hdl.handle.net/10388/etd-12122005-150824.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Jogi, Manoj. “A method for measuring smooth geomembrane/soil interface shear behaviour under unsaturated conditions.” 2005. Web. 17 Feb 2020.

Vancouver:

Jogi M. A method for measuring smooth geomembrane/soil interface shear behaviour under unsaturated conditions. [Internet] [Thesis]. University of Saskatchewan; 2005. [cited 2020 Feb 17]. Available from: http://hdl.handle.net/10388/etd-12122005-150824.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jogi M. A method for measuring smooth geomembrane/soil interface shear behaviour under unsaturated conditions. [Thesis]. University of Saskatchewan; 2005. Available from: http://hdl.handle.net/10388/etd-12122005-150824

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.