Meso structure analysis of fluid-solidified soil with different materials under freeze-thaw cycles
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摘要: 流态固化土常应用于回填工程。为探究流态土受材料、季节性气候影响而导致的力学性能劣化机理，开展冻融循环下预拌流态复合土的细观损伤变化规律研究，通过电镜扫描（SEM）及核磁共振（NMR）试验探究其细观结构变化规律，并对复合材料内部机制进行分析。研究结果表明：冻融循环作用会改变土体的孔隙形态，随冻融循环次数的增加微小孔隙逐渐演化为中、大孔隙；不同材料损伤程度不一，以水泥复合材料的破损程度最小，其次为石灰材料，在水化作用下会形成具有强度的胶结块，是抵抗变形的主要结构部分。该研究成果可为流态固化土材料研发和应用提供借鉴。Abstract: Fluid-solidified soil is often used in backfill engineering. To explore the deterioration mechanism of the mechanical properties of fluid-solidified soil caused by the influence of materials and seasonal climate, the change law of meso damage of ready mixed fluid composite soil under freeze-thaw cycle was studied. The change law of meso structure was explored by scanning electron microscope (SEM) and nuclear magnetic resonance (NMR) tests, and the internal mechanism of the composite material was analyzed. The results show that the freeze-thaw cycle will damage the pore size and morphology of soil, and with the increase in times, the micro pores gradually evolve into medium and large pores. The damage degree is different under different materials. The damage degree of the cement composite is the smallest, followed by the lime material. Under the hydration effect, it will form a strong adhesive block, which is the main structural part to resist deformation. The research results can provide a reference for the research and application of fluid-solidified soil materials.
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图 6 素黄土冻融作用细观结构图
Figure 6. Mesoscopic structure diagram of plain loess subjected to freeze-thaw cycles
图 7 水泥土冻融作用细观结构图
Figure 7. Mesoscopic structure diagram of cement-soil subjected to freeze-thaw cycles
图 8 石灰土冻融作用细观结构图
Figure 8. Mesoscopic structure diagram of lime-soil subjected to freeze-thaw cycles
图 9 粉煤灰土冻融作用细观结构图
Figure 9. Mesoscopic structure diagram of fly ash-soil subjected to freeze-thaw cycles
图 10 聚丙烯土冻融作用细观结构图
Figure 10. Mesoscopic structure diagram of polypropylene fiber-reinforced soil subjected to freeze-thaw cycles
图 12 不同粒径孔隙面积T2波谱分布柱状图
Figure 12. Bar chart of T2 spectrum distribution of pore area with different particle sizes
表 1 土样基本物理指标
Table 1. Basic physical indicators of soil samples
土体类别 天然
含水率/%天然干密度
/（g·cm−3）孔隙比 液限
/%塑限
/%黄土 14.1 1.65 0.69 31.8 17.8 
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表 2 电镜扫描试样
Table 2. Scanning electron microscopy sample
样品名称 冻融循环次数 素土 0 7 30 粉煤灰10% 0 7 30 聚丙烯0.2% 0 7 30 石灰5% 0 7 30 水泥15% 0 7 30
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表 3 孔隙分布统计表
Table 3. Statistical table of pore distribution
试样名称 孔隙分布/% 冻融循环0次 冻融循环7次 冻融循环30次 素黄土 1.64 12.31 13.31 粉煤灰10 7.74 12.77 15.54 粉煤灰20 14.04 15.76 23.62 聚丙烯0.2 3.67 16.67 17.14 聚丙烯0.8 13.64 6.05 21.35 石灰5 18.31 24.65 27.13 石灰20 20.07 22.68 32.74 水泥5 2.24 9.88 12.24 水泥10 13.85 5.49 15.18 水泥15 14.24 10.36 24.74
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