Stress–strain responses and yielding characteristics of a municipal solid waste (MSW) considering the effect of the stress path
Stress–strain responses and yielding characteristics of a municipal solid waste (MSW) considering the effect of the stress path
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DOI：
10.1007/s12665-014-3674-y
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发表时间：
2015-04
影响因子：
2.8
通讯作者：
X. Li;Jianyong Shi
中科院分区：
文献类型：
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作者：
X. Li;Jianyong Shi
城市生活垃圾的应力-应变特性是预测垃圾填埋场变形的重要依据。对MSW试样进行了不同应力路径下K 0固结三轴试验。在应力应变响应和耦合分量方面，将MSW的试验结果与粘土进行了比较。在三轴拉伸试验中，MSW的应力-应变响应与文献报道的粘土相似。在三轴压缩试验中，MSW的应力-应变响应与粘土不同，特别是在大应变下，MSW的曲率逐渐增大，但在≥ 0.当应力路径Δq= 0和Δp′ < 0时，MSW试样虽然体积膨胀，但轴向应变增大，这与粘土的性质不同。与粘土相比，MSW的交叉耦合响应更明显。MSW剪切模量和体积模量的变化最大值分别出现在q卸载区和p ′卸载区。得到了在p ′ − q空间中的MSW屈服面，证实了试件中纤维增强的存在。因此，应力应变响应，剪切和体积模量，以及屈服特性的MSW都密切相关的应力路径。
The stress–strain behavior of municipal solid waste (MSW) is important to predicate the deformation of MSW in landfills. Triaxial tests underK0consolidation 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≥ 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 inqunloading range andp′ unloading range, respectively. The yield surface of MSW inp′ −qspace 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.