A study of shear strength properties of municipal solid waste in Chongqing landfill, China

Abstract

The aim of this study is to analyze the effect of biodegradation on the shear strength of municipal solid waste (MSW), leachate, and biogas production. The direct shear (DS) test shows that the shear strength of waste in the initial stages is mainly depended on its composition and inter-structure. After the waste has been in a landfill for 30 days, the waste's increased biodegradation exhibited a great influence on the waste's shear strength. The increase of moisture content in the waste mass might cause a decrease of its shear strength. Tri-axial tests under consolidation-drained (CD) condition show that the shear strength of the cohesion and friction angle for degraded samples increased when the defined axial strain increased from 5 to 20 %. The cohesion varied from 35.90 to 66.42 kPa and the drained friction angle ranged between 29° and 38°. The measurements of shear strength properties are utilized to assess the slope stability of landfills.

Geotechnical Properties of Fresh and Degraded MSW In the Foothill of Shivalik Range Una, Himachal Pradesh

“…There are few studies existing on analyzing the properties of degradation of waste for landfill stability [20,36]. The strength characteristics of waste have an important role in designing of a landfill, which is a function of the waste composition, unit weight, degradation rate, moisture content [11,22]. The compressibility of waste decreased for degraded waste than fresh waste.…”

“…The change in the compressibility of waste changes the volume of MSW and affects the differential settlement in the landfill. The shear strength parameters get affected due to varied composition and degradation level of MSW which were considered to be most critical for the analysis of slope stability of landfill [16,18,22,[37][38][39]. The degradation of waste varies shear strength parameters as increases cohesion from 12 to 67 kPa and decreases the angle of internal friction from 38° to 24° [19,22,36,38,40].…”

“…The shear strength parameters get affected due to varied composition and degradation level of MSW which were considered to be most critical for the analysis of slope stability of landfill [16,18,22,[37][38][39]. The degradation of waste varies shear strength parameters as increases cohesion from 12 to 67 kPa and decreases the angle of internal friction from 38° to 24° [19,22,36,38,40]. However, the studies of various researchers [22,23,41] showed that the variation in c and φ values of samples did not follow any trend with the rate of degradation and similarly the effect of degradation on shear strength parameters was not following any pattern [23].…”

“…The geotechnical characteristics of MSW are important parameters for designing of landfill which considers engineering aspects like stability under seismic and static conditions, settlement (compression) behavior and during earthquakes, dynamic response of waste material as given in Table I [11,12,13]. The geotechnical aspects for designing of landfill include determination of unit weight, hydraulic conductivity, compressibility, shear strength characteristics of the municipal solid waste [7,9,[11][12][13][14][15][16][17][18][19][20][21][22][23]. The degradation of waste changes engineering properties of MSW which are useful for designing the various components of the landfill and also for assessing the geotechnical stability.…”

Modeling the flow behavior of a simulated municipal solid waste

“…It can be easily obtained from the comparison that the MSW simulant has the similar unit weight with real MSW. Many studies have been carried out on the shear strength of real MSW (Landva and Clark 1990;Jessberger 1994;Eid et al 2000;Pelkey et al 2001;Machado et al 2002;Feng 2005;Choudhury and Savoikar, 2009;Karimpour-Fard et al 2011;Reddy et al 2009Reddy et al , 2011Zhao et al 2014). The cohesion and internal friction angle range from 0 to 46 kPa and 9°to 43°, respectively, as shown in Fig.…”