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为了研究干湿循环条件下轻量土的水稳定性,通过密度试验、无侧限抗压强度试验和质量损失率试验,研究了轻量土的物理特性和力学性能。研究发现,轻量土的密度、强度和质量在长期干湿循环作用下具有很高的稳定性,其中强度还出现了一定程度的增长。这是由于轻量土中的水泥发生水解水化反应及轻量土各组分之间的相互作用,使土体的结构性逐渐增强,最终形成一个致密而稳定的网络状胶结结构,来抵抗干湿循环环境产生的侵蚀作用。在经受30次干湿循环作用后,密度的绝对变化量为0.02~0.06g/cm3,相对变化量为0.93%~4.47%。轻量土的密度在干湿循环作用下能够保持稳定,泡沫掺量对轻量土密度的影响较为显著。强度的绝对增长量为276.79~891.64kPa,相对增长量为71.46%~114.15%。其中,水泥掺量和含水量变化时,强度随干湿循环次数增加而变化比较敏感。质量损失率的变化范围大致在-1.00%~1.00%之间;随着干湿循环时间的推移,质量能够趋于稳定。即:轻量土在干湿循环作用下具有良好的水稳定性。
In order to study the water stability of lightweight soil under wet-dry conditions, the physical and mechanical properties of lightweight soil were studied by means of density test, unconfined compressive strength test and mass loss rate test. The study found that the density, strength and quality of light-weight soils are highly stable under the action of long-term wet-dry cycles, of which the strength has also increased to a certain extent. This is due to the hydrolysis and hydration reaction of light-weight soil cement and the interaction between the components of the light-weight soil, so that the structure of the soil is gradually enhanced and finally a dense and stable network-like cement structure is formed to resist Erosion caused by wet-dry environment. After 30 cycles of wet and dry cycles, the absolute change of density was 0.02 ~ 0.06g / cm3 and the relative change was 0.93% ~ 4.47%. The density of light-weight soil can be kept stable under the action of the wet-dry cycle. The effect of foam content on the light-weight soil density is significant. The absolute increase of intensity is 276.79 ~ 891.64 kPa, the relative increase is 71.46% ~ 114.15%. Among them, the cement content and water content changes, the intensity changes with wet and dry cycles more sensitive. The range of mass loss rate varies from -1.00% to 1.00%. With the drying cycle, the quality can be stabilized. That is, lightweight soil has good water stability under the action of the wet-dry cycle.