抗疏力固化剂改性黄土进失水能力研究

发布时间：2018-03-02 10:55

本文关键词： 黄土抗疏力固化剂进水能力渗透性失水能力　出处：《岩土力学》2016年S1期 　论文类型：期刊论文

【摘要】：抗疏力固化剂在我国黄土加固中运用较少,探究抗疏力固化剂是否有利于维持黄土内部干燥状态很有必要。采用抗疏力固化剂对重塑Q_3黄土改性,室内开展水滴入渗试验、柔性壁渗透试验、收缩试验及压力膜仪脱水试验,分别探讨抗疏力固化剂掺量对黄土进水、渗透及失水能力的影响。结果显示,随抗疏力固化剂掺量提高,土样斥水性急剧增大,明显优于粉煤灰、水泥、石灰改性土;渗透系数基本不变,水的流通性基本不变;干缩失水过程改性土样含水率及土-水特征曲线毛细作用区曲线斜率均变化不大,黄土失水能力基本不变。结合电镜及压汞试验结果可知,抗疏力固化剂对黄土中大孔隙、中孔隙体积含量影响较小,从而对黄土中水的流通及失去能力影响较少,证明抗疏力固化剂改性黄土斥水性明显提高,而失水能力基本不变,有利于维持黄土内部的干燥状态。
[Abstract]:The anti-thinning agent is seldom used in loess reinforcement in our country. It is necessary to explore whether the anti-thinning agent is beneficial to maintain the dry state of loess. The anti-thinning agent is used to modify Q3 loess, and the water droplet infiltration test is carried out in the laboratory. The effects of the content of anti-thinning agent on the influent, permeability and water loss of loess were studied in the tests of flexible wall penetration, shrinkage test and pressure film apparatus dehydration. The results showed that the content of anti-thinning agent increased with the increase of the content of anti-thinning agent. The water repellency of soil sample increases rapidly, which is obviously superior to that of fly ash, cement, lime modified soil, the permeability coefficient is basically unchanged, and the water circulation is basically unchanged. The water content of modified soil samples and the slope of capillary action zone of soil-water characteristic curve have little change, but the water loss ability of loess is basically unchanged. Combined with the results of electron microscope and mercury injection test, it can be seen that the anti-thinning agent has great porosity in loess. The medium pore volume content has little effect on the circulation and loss of water in loess. It is proved that the water-repellent property of loess modified by anti-thinning agent is obviously improved, but the water loss ability is basically unchanged, which is beneficial to maintain the dry state of loess.
【作者单位】：兰州大学西部灾害与环境力学教育部重点实验室;兰州大学土木工程与力学学院;
【分类号】：TU444

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