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RISS 인기검색어
- 검색키워드
- 저자 : ( James Law ) (검색결과 2 건)
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Evaluation of Slope Stability in Bioreactor Landfill Environment
( James Law ),( Robert Isenberg ) 한국폐기물자원순환학회 2011 ISWA Vol.2011 No.0
Slope stability evaluation in a bioreactor landfill environment, in which significant volumes of leachate or other liquids are introduced into the waste mass, is influenced by many factors. These factors include the waste shear strength and decomposition, the liner interface shear strength, landfill liquid and gas management practices, in-situ waste density, landfill operations and filling sequence, and final landfill slope configurations. Analytical and modeling experience is necessary to predict the landfill slope performance under bioreactor operation by calculating its factor of safety against instability. Bioreactor landfills should be engineered, constructed, monitored and operated purposefully to be stable under anticipated loading conditions. Landfill operations are critical to maintaining stability and providing conditions ideal for waste decomposition. This paper focuses on the effect of waste property changes in the in-situ waste density and its waste shear strength and thus to the factor of safety against slope movement due to operations of the landfill in a bioreactor environment. Definitions and calculations of the waste moisture content will be discussed in detail, whether it is by volumetric or gravimetric (wet or dry weight) basis, since it has significant impact of waste density and leachate volume calculations, and is frequently undefined in technical papers. Under bioreactor landfill environment, the moisture content and the in-situ waste density will increase and the waste shear strength will also change. The in-situ waste density on wet basis can be increased with depth of waste, compaction effort, soil daily cover, time and settlement, and moisture content addition as a result of bioreactor operations. These cumulative effects on in-situ waste density can increase by as much as 40 to 70 percent but have limited impact on its factor of safety when compared to the change in waste shear strength. Waste shear strength is the most critical parameter and will change over time due to the decomposition process and also with increasing moisture content. Although there is very limited information and testing on waste materials, some prediction and estimation can be done through the use of existing published data and also through back-calculation from documented landfill slope failures. A case study was presented to illustrate the sensitivity and impact on the calculated factor of safety by changing the waste shear strength and in-situ density for landfills operating under bioreactor environment. As illustrated from the results of this sensitivity study, it is recommended that as the waste density and its shear strength change with time, it is important to develop and follow an operations plan on bioreactor landfill based on design criteria and to monitor liquids, sludges, or other additions continuously. It is also important to keep liquids addition or injection away from slopes during bioreactor landfill operations.
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