Freeze–thaw resistance of eco–material stabilized loess  

作　　者：LI Guo-yu HOU Xin ZHOU Yu MA Wei MU Yan-hu CHEN Dun TANG Li-yun 

机构地区：[1]Da Xing'anling Observation and Research Station of Frozen–Ground Engineering and Environment,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Jiagedaqi 165000,Heilongjiang,China [2]State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [3]College of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi'an 710054,China [4]University of Chinese Academy of Sciences,Beijing 100049,China [5]Yuexiu Property Company Limited,Guangzhou 510623,China

出　　处：《Journal of Mountain Science》2021年第3期794-805,共12页山地科学学报（英文）

基　　金：funded by the China’s Second Tibetan Plateau Scientific Expedition and Research(2019QZKK0905);the National Natural Science Foundation of China(Nos.41672310 and U1703244);the Science and Technology Major Project of Gansu Province(143GKDA007);Research Project of the State Key Laboratory of Frozen Soils Engineering(SKLFSE-ZY-20)。

摘　　要：In the Loess Plateau in Northern China,repeated freeze–thaw(FT)cycles deteriorate the strength and structure of loess as a foundation soil,resulting in the instability or failure of supporting structure.Lignosulfonate is an eco–material,utilized as an effective and nontraditional stabilizer to improve the engineering properties of metastable soils.A series of laboratory tests,including unconfined compression tests,cyclic loading–unloading tests and scanning electron microscopy,on calcium lignosulfonate(CL)-and sodium lignosulfonate(SL)-stabilized loess were performed to investigate the stabilization effect,deterioration mechanisms of the FT cycles,and the resistance to FT cycles.Two traditional stabilizers,quicklime(QL)and sodium silicate(SS),were selected,and the engineering properties of QL-and SS-stabilized loess were compared with those of CL-and SLstabilized loess.The results showed that the strength values of CL-and SL-stabilized loess specimens decreased by 34.2%and 50%respectively,after 20 FT cycles,whereas those of the traditionally SS-and QL-stabilized specimens decreased by 85.3%and 82.87%,respectively.The elastic moduli of SL-and QL-stabilized loess specimens decreased by 22.1%and 92.0%,respectively.The mean energy dissipations of nontraditionally treated specimens also decreased significantly less than those of traditionally treated specimens.Overall,the results showed CL and SL had better stabilization effects on engineering properties of loess than QL and SS,and their stabilized loess specimens exhibited stronger resistance to FT cycles.The study findings demonstrated the significant potential of lignosulfonate for extensive application in cold loess areas.

关 键 词：Freeze thaw cycle LIGNOSULFONATE Loess mechanics Eco-material Cold region engineering Scanning electron microscopy 

分 类 号：P642.131[天文地球—工程地质学]