Abstract
The stress–strain behavior of municipal solid waste (MSW) is important to predicate the deformation of MSW in landfills. Triaxial tests under K 0 consolidation with different stress paths were carried out on MSW samples. Test results of the MSW are compared with that of clays in terms of stress–strain responses and coupled components. In triaxial extension tests, the stress–strain responses of MSW are similar to that of clays reported in literature. In triaxial compression tests, however, the stress–strain responses of the MSW are different from that of the clays, especially a progressively increasing upward curvature is observed at large strains without reaching a peak stress state on the compression stress paths of \(\Delta \sigma_{3}^{{\prime }}\) ≥ 0. For the stress paths Δq = 0 and Δp′ < 0, although the volume of MSW specimen is expanded, the axial strain is increased, which is different from the behavior of the clays. Compared to the clays, the cross-coupling responses of the MSW are more pronounced. The most variations for shear and bulk modulus of MSW occur in q unloading range and p′ unloading range, respectively. The yield surface of MSW in p′ − q space is obtained and the fibrous reinforcement within specimens is confirmed in this study. Consequently, the stress–strain responses, shear and bulk modulus, and yielding characteristics of MSW are all closely related to the stress path.
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Abbreviations
- p′:
-
Mean normal effective stress
- \(p_{0}^{{\prime }}\) :
-
Initial mean normal effective stress after consolidation
- q :
-
Deviator stress
- q 0 :
-
Initial deviator stress
- Δp′:
-
Increment of mean normal effective stress
- Δq :
-
Increment of deviator stress
- |Δq|:
-
Absolute value of deviator stress increment
- η = q/p′:
-
Stress ratio
- G :
-
Shear modulus
- K :
-
Bulk modulus
- W :
-
Strain energy
- \(\sigma_{1}^{\prime }\) :
-
Axial effective stress
- \(\sigma_{3}^{\prime }\) :
-
Radial effective stress
- \(\Delta \sigma_{3}^{\prime }\) :
-
The increment of radial effective stress
- ε a :
-
Axial strain
- ε r :
-
Radial strain
- ε s :
-
Shear strain
- ε v :
-
Volumetric strain
- |ε s|:
-
Absolute value of shear strain
- |ε v|:
-
Absolute value of volumetric strain
- \(p_{c}^{\prime }\) :
-
The largest mean normal effective stress of all yield points
- K 0 :
-
Coefficient of static lateral earth pressure
- \(\eta_{{K_{0} }}\) :
-
The initial stress ratio after K 0 consolidation
- \(\left( {p_{0}^{\prime } ,q_{0} } \right)\) :
-
The initial stress point after consolidation in p′ − q space
- \(\left( {p_{x}^{{\prime }} ,q_{x} } \right)\) :
-
The yield stress point in p′ − q space
- L 0 :
-
The length between the initial stress point after consolidation and the coordinate origin in p′ − q space
- L x :
-
The stress path length between the yield point and the initial stress point after consolidation along one stress path in p′ − q space
- L x /L x :
-
The ratio of L x to L 0
- α 0 :
-
The increasing magnitude of the initial deviator stress for the MSW after K 0 consolidation compared with the clay
- α x :
-
The change range of the yield deviator stress for the MSW compared with the clay along one stress path. The subscript x represents one stress path
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Acknowledgments
The authors appreciate the financial support provided by National Natural Science Foundation of China (No. 41172234).
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Li, X., Shi, J. Stress–strain responses and yielding characteristics of a municipal solid waste (MSW) considering the effect of the stress path. Environ Earth Sci 73, 3901–3912 (2015). https://doi.org/10.1007/s12665-014-3674-y
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DOI: https://doi.org/10.1007/s12665-014-3674-y