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University of Missouri - Columbia (2005)

Artificial soil as evapo-transpirative hydraulic barrier

Bobba, Ramesh

Titre : Artificial soil as evapo-transpirative hydraulic barrier

Auteur : Bobba, Ramesh

Université de soutenance : University of Missouri - Columbia

Grade : Master of Science (MS) 2005

The goal of this project is to assess the effectiveness of an artificial soil formed by mixing various industrial and municipal by-products as an evapotranspirative (ET) barrier to the fluid (liquid) flow. Artificial soil is placed to form a layered sequence simulating a natural soil containing two layers (O-horizon & C-horizon) with a combined depth ranging from 12 to 15 feet. Approximate volumes of cement kiln dust (CKD), biosolids, and coal ash are mixed for placement in the C-horizon. Bio-solids are mixed with yard waste and wood chips to form the O-horizon material, which is placed over the C-horizon after compost activity has been established. Two full-scale test sections were constructed and instrumented with moisture sensors, temperature sensors, lysimeters, and a surface rain gauge to quantify the amount of precipitation and subsequent moisture infiltration into the artificial soil layers. The test sections were monitored for a period of one year over a full cycle of precipitation and temperature extremes to evaluate their behavior as a hydraulic barrier. Concurrent laboratory tests were conducted to quantify relevant material properties, including Proctor density, specific gravity, saturated hydraulic conductivity, field capacity, and soil-water characteristic curves. Results from the laboratory effort were used as input to a finite-difference based seepage model. Modeling was conducted to develop a series of design charts that may be used to predict the behavior of artificial soil under simulated precipitation and evaporation events.

Mots clés : Applied sciences, Environmental engineering, Civil engineering

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Page publiée le 21 avril 2015, mise à jour le 15 janvier 2019