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.

Strain-hardening mechanism and applicability in hypergravity simulation of municipal solid waste

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.