Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (1): 245-249.doi: 10.16285/j.rsm.2017.1152

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Microstructure characteristics of solidified saline soil based on nuclear magnetic resonance

LÜ Qing-feng1, ZHOU Gang1, WANG Sheng-xin2, HUO Zhen-sheng1, MA Bo1   

  1. 1. Key Laboratory of Mechanics on Western Disaster and Environment Mechanics of Ministry of Education, Lanzhou University, Lanzhou, Gansu 730000, China; 2.Geological Hazards Research and Prevention Institute, Gansu Academy of Sciences, Lanzhou, Gansu 730000, China
  • Received:2017-06-07 Online:2019-01-11 Published:2019-01-31
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51469001).

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Abstract: NMR technique was used to test the micro-structural characteristics of the saline soil solidified with different proportions of water glass, lime and fly ash, lime and fly ash and water glass respectively. Combined the unconfined compression strength tests, the solidified effect of saline soil was analyzed, and the microstructure characteristic mechanism of strength cause was discussed. The results showed that the pore characteristics of different solidified soil were quite different. The macro-pores in saline soil solidified with lime and fly ash were reduced, while the total pore volume in saline soil solidified with water glass, lime and fly ash was decreased, but the macro-pores were increased. The pores in saline soil solidified with water glass were increased, but the pore volume decreased with the increase of water glass concentration. The compression strength of the soil solidified with water glass, lime and fly ash was greater than that of other solidification schemes, but its pore structure was not optimal, which indicated that the effect of cement between particles on solidification was much greater than that of pore characteristics.

Key words: nuclear magnetic resonance（NMR）, solidified saline soil, unconfined compression strength, microscopic characteristics, pore, cementation

CLC Number: 

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