冻融循环对加筋土结构性能影响的研究进展

Research Status of the Effect of Freeze-thaw Cycles on the Properties of Reinforced Soil Structure

加筋土结构因其具有因地制宜、性能优越和节能减碳等优点而在全球广泛应用。但在季节性冻土地区建造的加筋土结构在全生命周期内会经历多次冻融循环,而冻融循环对加筋土结构性能影响的研究尚不充分。基于已有研究,总结了冻融循环对加筋材料、回填土及加筋土单元体的影响,从室内试验、现场监测以及数值模拟三个方面并结合实际案例总结了加筋土结构在冻融循环作用下性能变化规律,指出了现有研究在冻融循环对加筋土结构的作用机理和评价指标等方面的不足,并展望了在冻融循环影响加筋土结构研究领域未来的发展方向,为加筋土结构的设计及长期稳定性分析提供支撑。

The reinforced soil structure is promoted worldwide due to its advantages of adapting to local conditions,superior performance,energy saving and carbon reduction.However,the reinforced soil structure built in seasonal frozen soil area will experience multiple freeze-thaw cycles in the whole life,and the research on the performance of reinforced soil structures influenced by freeze-thaw cycles is still insufficient.The results of investigations into the effect of freeze-thaw cycles on the reinforced materials,backfill and reinforced soil unit were presented,and the research results of performance changes of reinforced soil structures under freeze-thaw cycles were summarized from three aspects:laboratory test,field monitoring and numerical simulation,combined with practical cases.The inadequacy of the existing studies on the mechanism and evaluation index of freeze-thaw cycles on reinforced soil structure are pointed out,and the perspective on the evolution of this research area is proposed,which provides support for the design and long-term stability analysis of reinforced soil structures.