Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (2): 416-422.doi: 10.16285/j.rsm.2021.0473

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Effect of aerobic degradation on landfill settlement and development of a constitutive model

JIN Jia-xu1, DING Qian-shen1, 2, 3, LIU Lei2, 3, 4, WEI Wei2, 5, ZHANG Xiong6, ZHANG Chai2, 3, 7   

  1. 1. School of Civil Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 3. Hubei Province Key Laboratory of Contaminated Sludge and Soil Science and Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 4. IRSM-CAS/HK PolyU Joint Laboratory on Solid Waste Science, Wuhan, Hubei 430071, China; 5. University of Chinese Academy of Sciences, Beijing 100049, China; 6. Wuhan Environment Investment & Development Co., Ltd., Wuhan, Hubei 430019, China; 7. School of Mechanics and Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, China
  • Received:2021-04-02 Revised:2021-10-22 Online:2022-02-11 Published:2022-02-22
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41977254, 51974145), the Hubei Science Foundation for Distinguished Young Scholar (2021CFA096), the Foundation for Innovative Research Groups of Natural Science Fund of Hubei Province (2019CFA012) and the Open Fund of Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education (Tongji University) (KLE-TJGE-B2001).

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Abstract: The quantitative evaluation of the settlement characteristics of landfills by aerobic degradation is an important basis for predicting and evaluating the stabilization of aerobic degradation. The settlement characteristics of man-made waste soil with typical household waste composition ratio in Wuhan were tested under different ventilation conditions, and the influence of aerobic ventilation frequency on settlement deformation was analyzed. The results showed that aerobic ventilation significantly increased the settlement rate of municipal solid waste under anaerobic condition when the settlement rate was stable. The settlement efficiency of the upper, middle and lower layers of waste soil at high ventilation frequency was increased by 145%, 150% and 100% respectively, compared with the settlement efficiency at low ventilation frequency. Also, an anaerobic-aerobic combined settlement model (ANACS model) was established, and the reliability of the model was verified by comparing against the settlement values obtained from experimental monitoring. Outcomes from this study provide a theoretical basis for the evaluation of the settlement stability of waste soil in aerobic ventilation process.

Key words: waste soil, anaerobic condition, aerobic condition, settlement, model

CLC Number: 

  • TU 196.2
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