Bajda Marek, Lech Mariusz, Markowska-Lech Katarzyna, Osiński Piotr, Koda Eugeniusz
Institute of Civil Engineering, Warsaw University of Life Sciences, 02-787 Warsaw, Poland.
Faculty of Engineering, University of New South Wales, Sydney, NSW 2033, Australia.
Materials (Basel). 2025 May 6;18(9):2130. doi: 10.3390/ma18092130.
The stability and mechanical properties of municipal solid waste (MSW) deposits in closed landfills are critical for safe land reclamation and infrastructure development. This study employs Cone Penetration Testing (CPT) to evaluate the geotechnical parameters of aged waste at three closed landfill sites in central Poland. Key parameters, including shear strength, internal friction angle, density, and liquidity index, were assessed to determine slope stability and bearing capacity for future redevelopment. Due to the heterogeneous nature of MSW, CPT results were analyzed in conjunction with empirical correlations and nomograms to improve accuracy, so the parameters can be used for future numerical modeling and proposing new computational approaches for landfill body elastic and mechanical behavior predictions. The findings indicate significant variability in landfill waste mechanical properties, influenced by waste composition, decomposition stage, and compaction history. The study highlights CPT's reliable detremination of geotechnical parameters for landfill restoration projects, particularly for infrastructure, creating the potential for green energy and sustainable development. The results contribute to improving engineering practices in landfill restoration and ensuring the long-term stability of post-closure land use. This study also contributes to obtaining reliable results on anthropogenic waste material mechanical parameters at both the material point and at the overall structural scale, benefiting future computational methods and modeling approaches for analyzing structural and geotechnical safety of such complex and demanding structures as landfills.
封闭垃圾填埋场中城市固体废物（MSW）沉积物的稳定性和力学性能对于安全的土地复垦和基础设施建设至关重要。本研究采用圆锥贯入试验（CPT）来评估波兰中部三个封闭垃圾填埋场中老化垃圾的岩土工程参数。评估了包括抗剪强度、内摩擦角、密度和液性指数在内的关键参数，以确定未来再开发的边坡稳定性和承载能力。由于城市固体废物的非均质性，CPT结果结合经验相关性和诺模图进行分析以提高准确性，从而使这些参数可用于未来的数值建模，并为填埋体弹性和力学行为预测提出新的计算方法。研究结果表明，填埋垃圾的力学性能存在显著差异，这受到垃圾成分、分解阶段和压实历史的影响。该研究强调了CPT在确定填埋场修复项目岩土工程参数方面的可靠性，特别是对于基础设施而言，为绿色能源和可持续发展创造了潜力。研究结果有助于改进填埋场修复中的工程实践，并确保封场后土地利用的长期稳定性。本研究还有助于在材料点和整体结构尺度上获得关于人为废物材料力学参数的可靠结果，有利于未来分析填埋场等复杂且要求高的结构的结构和岩土安全性的计算方法和建模方法。
