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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2022, Vol. 56 Issue (4): 664-673    DOI: 10.3785/j.issn.1008-973X.2022.04.005
    
Strain-hardening mechanism and applicability in hypergravity simulation of municipal solid waste
Jia MENG1,2(),Jun-chao LI1,2,*(),Yun-min CHEN1,2
1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China
2. Center for Hypergravity Experiment and Interdisciplinary Research, Zhejiang University, Hangzhou 310058, China
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Abstract  

Materials such as plastic and peat, quartz sand and kaolin were selected to conduct experimental researches on the characteristics of the organic fiber and soil particles of municipal solid waste (MSW) in order to analyze the strain-hardening mechanism and applicability in hypergravity simulation of MSW. Results show that organic fiber plays a leading role in the strain-hardening characteristics of MSW, and can significantly increase the strength of MSW. The increase in the mass fraction of quartz sand in the soil particles can increase the strength of MSW at small strains, while the increase of the kaolin mass fraction will significantly decrease the failure strain and the peak deviatoric stress of MSW. A method to quantitatively control the mass fraction of organic fiber was proposed based on the effect of each component in order to prepare model MSW. The characteristics of the model MSW accorded with the real MSW. The landfill instability critical water level ratios calculated by the strength parameters of model MSW accorded with the results of the centrifugal simulation tests. The applicability of the hypergravity simulation of the model MSW was verified, which provided an important basis for hypergravity simulation research on deformation and stability of the landfill.

Key words： municipal solid waste (MSW)      model MSW      strain-hardening      organic fiber      applicability of hypergravity simulation     
Received: 15 May 2021      Published: 24 April 2022
CLC:  TU 411  
Fund:  国家自然科学基金资助项目（51988101）; 浙江省基础公益研究计划资助项目（LGF21E080013）
Corresponding Authors: Jun-chao LI     E-mail: 1065467906@qq.com;lijunchao@zju.edu.cn
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Jia MENG
Jun-chao LI
Yun-min CHEN
Cite this article:

Jia MENG,Jun-chao LI,Yun-min CHEN. Strain-hardening mechanism and applicability in hypergravity simulation of municipal solid waste. Journal of ZheJiang University (Engineering Science), 2022, 56(4): 664-673.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2022.04.005     OR     https://www.zjujournals.com/eng/Y2022/V56/I4/664


固废应变硬化机理与超重力模拟适用性

为了探究城市固废应变硬化机理及模型固废在超重力模拟试验中的适用性，选用塑料和草炭、石英砂和高岭土等材料，分别对固废有机纤维和土颗粒的各项特性进行试验研究. 结果表明，有机质纤维对固废的应变硬化特性起主导作用，可以显著地提高固废强度；土颗粒中石英砂质量分数增加可以提高固废在小应变时的强度，高岭土质量分数增大会导致固废破坏应变及偏应力峰值明显减小. 基于各组分作用，提出定量控制有机纤维质量分数的方法配制模型固废，配制出的模型固废与真实固废的各项特性非常吻合. 采用模型固废强度参数计算得到的填埋场失稳临界水位比与离心模拟试验结果一致，验证了所配固废的超重力模拟适用性，为填埋场变形与稳定超重力研究提供了重要依据.


关键词： 城市固体废弃物（MSW）,  模型固废,  应变硬化,  有机纤维,  超重力模拟适用性 
固废种类 wB/%
厨余垃圾 塑料 纸、木、纺织物、皮革等纤维 煤渣和粉尘 金属和玻璃
新鲜固废 32.4 18.4 16.3 29.3 3.6
部分降解固废 16.4 17.6 10.2 53.3 2.5
Tab.1 Components of MSW from Suzhou Qizishan landfill
Fig.1 Stress-strain curves of different components of MSW
Fig.2 Materials of model MSW
试验
组别 		σ3/kPa mp∶mk∶mq
 wor/% wk/% wq/%
ZF1 200 1∶0.5∶0 34.3 33.3 0
ZF2 200 1∶0∶0.5 34.3 0 33.3
ZF3 200 1∶0.2∶0.3 34.3 13.33 20
ZF4 200 1∶0.2∶0.4 32.2 12.5 25
ZF5 200 1∶0.2∶0.6 28.6 16.67 33.33
ZF6 200 1∶0.2∶0.8 25.75 10 40
ZF7 200 1∶0.33∶0.33 30.9 20 20
ZF8 200 1∶0.5∶0.5 25.75 25 25
ZF9 200 1∶0.67∶0.67 22.1 28.57 28.57
ZF10 200 1∶0.8∶0.8 19.8 30.77 30.77
ZF11 200 1∶1∶1 17.2 33.33 33.33
ZF12 200 0∶1∶1 0 50 50
Tab.2 Analysis of role of each component of MSW
试验
组别 		试样种类 σ3/kPa mk∶mq
 wor/%
JX1-1 石英砂+高岭土 100 1∶4 0
JX1-2 石英砂+高岭土 200 1∶4 0
JX1-3 石英砂+高岭土 400 1∶4 0
JX2-1 高岭土+石英砂+塑料筋相 100 1∶4 3
JX2-2 高岭土+石英砂+塑料筋相 200 1∶4 3
JX2-3 高岭土+石英砂+塑料筋相 400 1∶4 3
JX3-1 高岭土+石英砂+草炭 100 1∶4 3
JX3-2 高岭土+石英砂+草炭 200 1:4 3
JX3-3 高岭土+石英砂+草炭 400 1∶4 3
JX4-1 高岭土+石英砂+塑料筋相 200 1∶4 7
JX4-2 高岭土+石英砂+塑料筋相 200 1∶4 10
JX5-1 高岭土+石英砂+草炭 200 1∶4 7
JX5-2 高岭土+石英砂+草炭 200 1∶4 10
Tab.3 Analysis of role of organic phase
Fig.3 Samples with different organic phase mass fraction
Fig.4 Triaxial test procedure
Fig.5 Stress-strain curve of model MSW with different kaolin mass fraction
Fig.6 Stress-strain curve of model MSW with different quartz sand mass fraction
Fig.7 Influence of organic phase mass fraction on model MSW
Fig.8 Comparison of stress-strain curves of model MSW with different organic phase mass fraction
Fig.9 Influence of different reinforcement on stress-strain characteristics of model MSW
Fig.10 Influence of organic phase mass fraction on peak deviator stress and failure strain
Fig.11 Influence of cosmid mass fraction on peak deviator stress and failure strain
配置方法 试验
组别 		试样种类 σ3/kPa mk∶mq wor/%
经验法 JY-1 高岭土+石英砂+草炭 100 1∶4 34.3
JY-2 高岭土+石英砂+草炭 200 1∶4 34.3
JY-3 高岭土+石英砂+草炭 400 1∶4 34.3
有机筋相
控制法 		KZ1-1 高岭土+石英砂+草炭 100 1∶4 35
KZ1-2 高岭土+石英砂+草炭 200 1∶4 35
KZ1-3 高岭土+石英砂+草炭 400 1∶4 35
KZ2-1 高岭土+石英砂+草炭 100 1∶4 45
KZ2-2 高岭土+石英砂+草炭 200 1∶4 45
KZ2-3 高岭土+石英砂+草炭 400 1∶4 45
Tab.4 Research on applicability of model MSW
Fig.12 Model MSW with different mass fraction of peat phase
固废种类 T/a h/m wor/% ww/% γ/（kN·m?3） e E/MPa?1 k/（10?6m·s?1）
模型固废 （新鲜） — — 45 60 8 2.5 3.6 6.1
模型固废 （部分降解） — — 35 50 9 1.6 2.4 4.4
七子山固废 （新鲜） 0 5 40~50 65 8.3 2.7 3.3 6.24
七子山固废 （部分降解） 5 15 30~40 50 9.4 1.7 2.2 4.76
经验法[12] （新鲜） — — — 55 7 2.9 3.19 6.6
经验法[12] （部分降解） — — — 45 9 1.6 2.26 4.4
Tab.5 Comparison of basic characteristics of MSW
Fig.13 Comparison of stress-strain curves between model MSW and real MSW
固废种类 εf/% 模型固废 七子山 经验法[12]
c'/kPa $\varphi {'} $/(°) c'/kPa $\varphi {'} $/(°) c'/kPa $\varphi {'} $/(°)
新鲜 10 26.0 14.0 24.0 14.7 25 13.5
20 28.7 25.5 27.0 25.8 30 24.9
部分降解 10 21.0 15.7 23.2 15.0 27 13.4
20 26.0 27.6 29.2 25.7 24 28.8
Tab.6 Comparison of strength parameters between model MSW and real MSW
Fig.14 Slope model of partly degraded MSW
Fig.15 Slope model under critical condition
固废种类 εf/% hw/H dr/% dc/%
离心试验 （新鲜） — 0.81 — —
七子山真实固废 （新鲜） 10 0.63 — —
七子山真实固废 （新鲜） 20 0.80 — 1.2
本次配置固废 （新鲜） 10 0.64 1.6 —
本次配置固废 （新鲜） 20 0.82 2.5 1.2
离心试验 （部分降解） — 0.79 — —
七子山真实固废 （部分降解） 10 0.71 — —
七子山真实固废 （部分降解） 20 0.81 — 2.5
本次配置固废 （部分降解） 10 0.69 2.8 —
本次配置固废 （部分降解） 20 0.83 2.4 5.0
Tab.7 Comparison of critical water level of different MSW
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