Gao Yucong, Hao Dongxue, Liu Xuejun, Chen Kai, Chen Rong, Guo Ruifeng
School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin, 132012, China.
Xinjiang Institute of Architectural Sciences (Limited Liability Company), Urumqi, 830002, China.
Sci Rep. 2024 Jul 19;14(1):16659. doi: 10.1038/s41598-024-67548-y.
Freeze-thaw cycles are frequently overlooked as a pivotal factor contributing to leakage and structural failures in clayey soil-impermeable barriers used in landfills or tailings repositories in regions subject to seasonal freezing. This investigation explores the recovery and residual strength properties of Jilin ball clay undergoing six freeze-thaw cycles, and assesses the pore structure characteristics through a series of nuclear magnetic resonance (NMR) tests. The results indicate that normal stress has a greater impact on peak recovery strength than dry density and rest periods. Cohesion increases earlier and more significantly during rest periods compared to internal friction angle. Although the pore diameter remains consistent within the micropores during the freeze-thaw cycles, the soil's structural integrity undergoes notable changes. The concluding analysis provides valuable insights for the construction and management of impermeable barriers in landfills or tailings repositories within seasonally frozen areas.
在季节性冻土地区，用于垃圾填埋场或尾矿库的黏土防渗屏障中，冻融循环常被忽视，它是导致渗漏和结构破坏的关键因素。本研究探讨了经历六个冻融循环的吉林球黏土的恢复强度和残余强度特性，并通过一系列核磁共振（NMR）试验评估了其孔隙结构特征。结果表明，与干密度和休止期相比，法向应力对峰值恢复强度的影响更大。与内摩擦角相比，休止期内黏聚力增加得更早且更显著。尽管在冻融循环过程中微孔内的孔径保持一致，但土壤的结构完整性发生了显著变化。最终分析为季节性冻土地区垃圾填埋场或尾矿库防渗屏障的建设和管理提供了有价值的见解。
