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ABSTRACT
With the rapid increase of city waste, landfills have become a major method to deals with municipal solid waste. Thus, the safety of landfills has become a valuable research topic. In this paper, Jiangcungou Landfill, located in Shaanxi, China, was investigated and its slope stability was analyzed. Laboratory tests were used to obtain permeability coefficients of municipal solid waste. Based on the results, the distribution of leachate and stability in the landfill was computed and analyzed. These results showed: the range of permeability coefficient was from 1.0 × 10–7 cm sec–1 to 6.0 × 10–3 cm sec–1 on basis of laboratory test and some parameters of similar landfills. Owing to the existence of intermediate cover layers in the landfill, the perched water level appeared in the landfill with heavy rain. Moreover, the waste was filled with leachate in the top layer, and the range of leachate level was from 2 m to 5 m in depth under the waste surface in other layers. The closer it gets to the surface of landfill, the higher the perched water level of leachate. It is indicated that the minimum safety factors were 1.516 and 0.958 for winter and summer, respectively. Additionally, the slope failure may occur in summer.
Implications: The research of seepage and stability in landfills may provide a less costly way to reduce accidents. Landslides often occur in the Jiangcungou Landfill because of the high leachate level. Some measures should be implemented to reduce the leachate level. This paper investigated seepage and slope stability of landfills by numerical methods. These results may provide the basis for increasing stability of landfills.
Funding
This study was financially supported by the program 2013KCT-15 for Shaanxi Provincial Key Innovative Research Team; the National Natural Science Foundation of China (51409206 and 51409208); the research foundation of State Key Laboratory Base of Eco-hydraulic in Arid Area (2013ZZKT–3); the special research plan project of Education Department of Shaanxi Province (14JK1514); the special funds for the natural science foundation of Shaanxi province (2016JM5057); and the National Science Foundation for Post-doctoral Scientists of China (2014M562524XB).
Additional information
Funding
Notes on contributors
Rong Yang
Rong Yang, Zengguang Xu, Junrui Chai, Yuan Qin, and Yanlong Li are researchers of hydraulic structure at State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area and Xi´an University of Technology.
Zengguang Xu
Rong Yang, Zengguang Xu, Junrui Chai, Yuan Qin, and Yanlong Li are researchers of hydraulic structure at State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area and Xi´an University of Technology.
Junrui Chai
Junrui Chai also is a researcher at China Three Gorges University.
Yuan Qin
Rong Yang, Zengguang Xu, Junrui Chai, Yuan Qin, and Yanlong Li are researchers of hydraulic structure at State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area and Xi´an University of Technology.
Yanlong Li
Rong Yang, Zengguang Xu, Junrui Chai, Yuan Qin, and Yanlong Li are researchers of hydraulic structure at State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area and Xi´an University of Technology.