Investigation of the Geotechnical Properties of Municipal Solid Waste as a Function of Placement Conditions

Wong, Wilson W

doi:10.15368/theses.2009.130

Cited by 5 publications

(9 citation statements)

References 57 publications

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“…Some laboratory and field compaction studies have been conducted in recent years to determine the compaction characteristics of waste (e.g., Gabr and Valero 1995;Itoh 2005;Von Stockhausen 2007;Wong 2009). Von Stockhausen (2007) and Wong (2009) determined that moisture addition prior to compaction can increase waste placement efficiency and improve the as-placed unit weight of waste however, the representativeness of the tests were limited. A meso-and full-scale compaction test program was implemented at SMRL to determine the effects of systematic moisture addition on placement efficiency and as-placed density of Chapter 2: Literature Review…”

Section: An Extensive Laboratory and Field Test Program Was Conductedmentioning

confidence: 99%

“…Specifically, Hanson et al (2010a) Particle densities for MSW constituent components or overall MSW also have been provided in the literature and in general, these data were obtained using indirect methods and not through direct measurements. Weighted average particle density (Landva and Clark 1990;Olivier and Gourc 2007;Stoltz et al 2010a) and specific gravity (Wong 2009) values for MSW were determined using the individual waste constituent densities or specific gravities (Landva and Clark 1990;Olivier and Gourc 2007;Wong 2009;Stoltz et al 2010 Landva and Clark (1990) to the weight-based percentage breakdown of constituents discarded into U.S. landfills in 1990 (USEPA 2013a). Olivier and Gourc (2007) reported a waste solid density of 1.03 Mg/m 3 for a manufactured waste sample.…”

Section: Specific Gravity Of Mswmentioning

confidence: 99%

“…Stockhausen (2007), and Wong (2009) demonstrated that increasing the effort during the compaction of MSW will result in an increase in the overall density of the waste for a given moisture content (i.e., upward shift of compaction curve).…”

Section: Compaction Of Mswmentioning

confidence: 99%

“…In comparison to the physical and other engineering properties of MSW, limited studies have been conducted on the compaction characteristics of MSW (Harker and Juds 1976;Ham et al 1978;Harris 1979;Surprenant and Lemke 1994;Gabr and Valero 1995;Collins 2001;Marques et al 2002;Hettiarachchi 2005;Itoh et al 2005;Fakher 2006;Von Stockhausen 2007;Reddy et al 2009b;Wong 2009;Wang et al 2012). A laboratory investigation was performed by Harker and Juds (1976) to investigate the effectiveness of roller compaction on individual waste constituents (e.g., glass bottles, aluminum cans, various metal containers).…”

Section: Compaction Of Mswmentioning

confidence: 99%

“…These specimens were then mixed in the same large bowl by hand. Dry and wet of optimum moisture contents were determined to be 30 and 90%, respectively using laboratory waste compaction curves associated with 4X modified compaction effort that were generated by Wong (2009). Both the dry and wet of optimum moisture contents corresponded with a dry unit weight of 5.3 kN/m 3 .…”

Section: Test Materials Sample Collection and Preparationmentioning

confidence: 99%

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Effects of Waste Placement Practices on the Engineering Response of Municipal Solid Waste

Cox¹

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Effects of Waste Placement Practices on the Engineering Response of MunicipalSolid Waste Jason T. Cox An extensive laboratory and field investigation was conducted at Santa Maria Regional Landfill (SMRL) in Santa Maria, California to determine the effects of waste placement practices on the engineering response of municipal solid waste (MSW). Laboratory and field testing was used to determine the engineering properties and monitor field response of MSW.The specific gravity (G s ) of manufactured MSW (MMSW), fresh MSW (FMSW), and old MSW (OMSW) was determined experimentally using a modified version of standard soil testing procedures. Effects of particle size, compactive effort, and degradation on the specific gravity of waste were evaluated. Specific gravity of manufactured waste samples increased with decreasing particle size, with compaction, and with increased degradation. The average specific gravity of uncompacted MMSW samples was 1.333, 1.374, and 1.424 for coarse, medium, and fine particle sizes, respectively. Specific gravity of coarse, medium, and fine MMSW samples compacted at dry of optimum ( = 30%) was determined to be 1.497, 1.521, and 1.552, respectively and at wet of optimum ( = 90%) to be 1.500, 1.542, and 1.570, respectively. The compacted and uncompacted specific gravity of fresh MSW was lower than manufactured and old MSW. The average G s of uncompacted and compacted fresh MSW was 1.072 and 1.208, respectively whereas old MSW had G s of 2.201.v Additional physical and engineering properties of MSW were determined for fresh and old wastes. A total of 8 magnetic extensometer settlement arrays and 4 thermocouple arrays were installed in old wastes. The settlement and temperature data were collected for an approximate duration of 1 year. In addition, laboratory experiments were conducted to determine the particle size distribution, organic content, and moisture content of fresh waste sampled from the active face of the landfill and from old waste sampled from different depths.The particle size distribution of OMSW was comparable to a well-graded coarsegrained soil. The average baseline moisture content of incoming MSW at SMRL was 42.7% (dry-weight basis). The average moisture content of residential MSW, commercial MSW, and self-delivered MSW were determined to be 57.7, 46.3, and 12.0%, respectively. The organic content of fresh and old MSW was determined to be 77.2 and 23.5%, respectively. Temperature increased over time due to heat generation of the waste mass. The temperature increased on average 3 to 6°C between the initial and final day of measurements for wastes that were 0.3 to 9 years old.Fresh and old wastes at SMRL exhibited unique compression behavior. A majority of the waste was undergoing secondary compression characterized using a secondary compression ratio ( ′ ) ranging from 0.013 to 0.067 with an average of 0.030. In addition, the fresh and old wastes exhibited recompression behavior. Fresh waste lifts were determined to be slightly overconsolidated such that the self-weig...

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Section: An Extensive Laboratory and Field Test Program Was Conductedmentioning

confidence: 99%