摘要
针对我国工程建设中废弃渣土改良固态土路用动力特性问题,提出采用水泥-粉煤灰复合固化剂改良废弃渣土制备流态固化土,通过DDS-70电磁式动三轴试验系统模拟交通荷载(半正弦波,1 Hz,20~520 kPa分级加载),系统研究水固比与灰土比对材料动力特性的影响规律。结果表明:渣土改良流态固化土的动应力-动应变关系呈显著非线性特征,灰土比增加可缩短弹性阶段并提升弹性极限应力至280 kPa;阻尼比随动应变呈现先减后增趋势,峰值达35%,灰土比提高显著增强能量吸收效率;长期动载下累积塑性变形可控,典型市政交通荷载(≤200 kPa)下的应变值满足路基稳定性阈值要求。流态固化土凭借其自密实性、低水泥用量及泵送施工优势,不仅实现了工程废弃渣土的高效资源化利用,同时降低了施工成本与碳排放,为绿色基础设施建设提供了兼具性能与环保效益的创新型解决方案。
To address the problem of road dynamics of solid soil improved by waste residue in engineering construction in China,it is proposed to adopt cement-fly ash composite curing agent to improve waste residue to prepare fluid cured soil,simulate traffic load(half sine wave,1 Hz,20-520 kPa graded loading)by DDS-70 electromagnetic dynamic triaxial test system,and systematically study the influence of the water-to-solid ratio and the grey-to-soil ratio on the dynamics of the material.The results shows that the dynamic stress-strain relationship of slag-improved fluid-consolidated soil shows significant non-linear characteristics,and the increase of grey-soil ratio can shorten the elastic phase and raise the elastic ultimate stress to 280 kPa;the damping ratio shows a trend of decreasing and then increasing with the dynamic strain,and the peak value reaches 35%,and the increase of grey-soil ratio significantly enhances the efficiency of energy absorption;the cumulative plastic deformation is controllable under long-term dynamic loading,and the strain value under typical municipal traffic load(≤200 kPa)meets the requirements of the roadway dynamic characteristics.With its self-compacting,low cement consumption and pumping advantages,fluid cured soil not only realises the efficient resource utilisation of engineering waste soil,but also reduces construction costs and carbon emissions,providing an innovative solution for green infrastructure construction that combines performance and environmental benefits.
作者
吴跃东
张瑞星
刘坚
杨博文
WU Yuedong;ZHANG Ruixing;LIU Jian;YANG Bowen(College of Civil and Transportation,Hohai University,Nanjing 210098,China)
出处
《粉煤灰综合利用》
2025年第4期100-104,共5页
Fly Ash Comprehensive Utilization
基金
国家自然科学基金(52378337)。
关键词
废弃渣土资源化利用
流态固化土
动三轴试验
动力特性
灰土比
resource utilisation of waste dirt
fluidised solidified soil
dynamic triaxial test
dynamic behaviour
fly ash content ratio
