固化盐渍土核磁共振微观特征

采用核磁共振技术，对不同配比的水玻璃、石灰+粉煤灰及石灰+粉煤灰+水玻璃的固化盐渍土的微观特征进行检测，结合无侧限抗压强度试验，分析了各固化方案的盐渍土固化效果，讨论了强度成因的微观特征机制。结果表明，不同固化土的孔隙特征有较大差异。石灰+粉煤灰固化盐渍土大孔隙减少；石灰+粉煤灰+水玻璃固化盐渍土孔隙总体积减少，但同时有大孔隙生成；水玻璃固化盐渍土孔隙总体增多，但随水玻璃浓度增大，孔隙体积有所减小。石灰+粉煤灰+水玻璃固化盐渍土抗压强度远大于其他固化方案，但是其孔隙结构并不是最优，说明颗粒间的胶结情况对固化效果的影响远大于孔隙特征。

Microstructure characteristics of solidified saline soil based on nuclear magnetic resonance

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.