Abstract
With the continued expansion of waste landfills, accidents may occur if the landfills are not properly stabilized. In this study, samples of municipal solid waste (MSW) from a waste landfill in Xi'an, China were collected through on-site drilling. Considering the effects of nine landfill ages (1, 2, 3, 11, 12, 13, 21, 22, and 23 y) and six moisture contents (natural, 20, 40, 60, 80, and 100%), 324 groups of MSW were tested in the laboratory using a direct shear test apparatus. The results indicate the following: (1) with an increase in horizontal shear displacement, the shear stress of MSW gradually increases without a peak stress phenomenon, which is a displacement hardening curve; (2) with an increase in landfill age, the shear strength of MSW increases; (3) with an increase in moisture content, the shear strength of MSW increases; (4) with an increase in landfill age, the cohesion (c) decreases and the internal friction angle (φ) increases; and (5) with an increase in moisture content, the c and φ of MSW increases. The c range found in this study was 6.04–18.69 kPa, while the φ was 10.78–18.26°. The results of this study can provide a reference for stability calculations for MSW landfills.
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The datasets used and analyzed in the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We thank the employees of Xian Jiangcungou Landfill for their assistance.
Funding
This research was funded by the National Natural Science Foundation of China (Contract Nos. 51978625 and 51678532), supported by the Zhejiang Provincial Natural Science Foundation of China under Grant No. LZ21E080003, and key research and development plan of Zhejiang Province under Grant No. 2021C02039.
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Menghe Huang conducted the direct shear test on municipal solid waste in the Xi'an landfill, and analyzed the relationship between the shear strength of MSW and moisture content and landfill age. Bin Zhu, Jiahe Zhang and Hui Xu conducted the direct shear test on municipal solid waste in the Xi'an landfill; Zhenying Zhang analyzed the test data and reviewed and revised the manuscript. All authors read and approved the final manuscript.
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Huang, M., Zhang, Z., Zhu, B. et al. Effects of moisture content and landfill age on the shear strength properties of municipal solid waste in Xi'an, China. Environ Sci Pollut Res 30, 65011–65025 (2023). https://doi.org/10.1007/s11356-023-26905-6
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DOI: https://doi.org/10.1007/s11356-023-26905-6