Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

You searched for subject:(normalized head ). One record found.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


University of Saskatchewan

1. Nguyen, Huyen. The hydraulic behavior of free flowing granular drains.

Degree: 2012, University of Saskatchewan

Granular drains are among the most effective tools for controlling the migration of contaminants. For long-term decommissioning in the mining industry, these drains might be subjected to clogging caused by fine particles of the surrounding soils. Fine particles become trapped in the granular drains, lowering permeability and reducing effectiveness. Therefore, it is necessary to minimize the effect of clogging by allowing particles to move more freely within the drains. The primary objectives of this research were to: i) Develop an understanding about the nature of clogging in sand drain materials subjected to infiltration of fines; ii) Measure the impact of a wide range of fines on clogging of typical sand drain materials; and iii) Modify an existing clogging model to more accurately predict permeability reduction. This study is a continuation of Bergerman’s (2011) study. The laboratory test program was built based on that study with some modifications to the test apparatus to gain better control over the output data. In addition, this study examined a wider range of variables, including particle size, clay activity and swelling capacity. The laboratory test program was conducted using three types of granular drainage soils: Coarse sand, Uniform sand and French drain sand, all under low gradient conditions. In order to simulate the transient effects of different fines on drainage sands, various suspensions of kaolinite, Battleford till and bentonite fines were used to infiltrate the sands. The test equipment used was similar to that of Bergerman’s (2011) study but with bigger inlet and outlet tubes and a fixed inflow elevation. These modifications were made with the goal of achieving a condition in which all head losses occurred only in the sand. Test results were recorded in terms of total heads versus time and were interpreted to determine the changes in head due to clogging of fine particles in the inflow. A normalization method was employed in the interpretation process to scale all test results to the same boundary conditions, which is important when comparing results from one test to another. The result of the test program showed that Coarse sand and Uniform sand were able to maintain flow longer than French drain sand due to their coarse nature. The positions of fines captured in these sand samples were also different. Fines were captured mostly at the effluent end in the Coarse sand column, at the middle of the Uniform sand column, and at the influent end of the French Drain sand column. Among the fines chosen, Bentonite was the most active clay with a plasticity index of 473%, activity of 6.5 and modified free swelling index of 58.5. The presence of fully water-absorbed bentonite particles and flocculation caused fast clogging in the sand samples. A model, developed by Reddi et al. (2000), was chosen to simulate the test results in this study. The proposed modelling equations were applied with modifications in critical velocity of flow and the characteristic pore length of drain sand. These… Advisors/Committee Members: Haug, Moir D., Barbour, Lee, Hawkes, Christopher D..

Subjects/Keywords: Granular drains; Clogging; infiltration; drainage soil; head loss; hydraulic head; normalized head.

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Nguyen, H. (2012). The hydraulic behavior of free flowing granular drains. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2012-01-404

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):

Nguyen, Huyen. “The hydraulic behavior of free flowing granular drains.” 2012. Thesis, University of Saskatchewan. Accessed December 06, 2019. http://hdl.handle.net/10388/ETD-2012-01-404.

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

MLA Handbook (7th Edition):

Nguyen, Huyen. “The hydraulic behavior of free flowing granular drains.” 2012. Web. 06 Dec 2019.

Vancouver:

Nguyen H. The hydraulic behavior of free flowing granular drains. [Internet] [Thesis]. University of Saskatchewan; 2012. [cited 2019 Dec 06]. Available from: http://hdl.handle.net/10388/ETD-2012-01-404.

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

Council of Science Editors:

Nguyen H. The hydraulic behavior of free flowing granular drains. [Thesis]. University of Saskatchewan; 2012. Available from: http://hdl.handle.net/10388/ETD-2012-01-404

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

.