冬灌区粉砂的反复冻融效应

发布时间：2018-03-03 22:14

  本文选题：岩土工程　切入点：粉砂　出处：《科学技术与工程》2017年14期 　论文类型：期刊论文

【摘要】：结合宁夏当地气候和冬灌区粉砂的区域特点,以含水率和冻融循环次数为因素,应用封闭系统一维冻融试验方法,研究了粉砂冻胀、融沉和压缩性的冻融效应,分析了压缩性的冻融效应与冻融变形的相关性。结果表明:粉砂的冻胀率、融沉系数和压缩系数增量均随冻融循环次数的增加而增大,在前几次冻融循环内变化剧烈,随后趋于平缓,一定冻融循环后达到稳定。其达到稳定的冻融循环次数与含水率有关,随含水率的增大而增大。含水率使冻融循环效应增大,冻融循环使含水率效应提高。压缩系数增量与冻融变形率间存在非常好的线性相关性,且与理论分析吻合。研究结果对宁夏冬灌区砂土地基工程冻害评价与防治具有重要的指导意义。
[Abstract]:Combined with the regional characteristics of silt in Ningxia local climate and winter irrigation area, the freezing and thawing effects of silt on frost heave, thawing settlement and compressibility were studied by using the one-dimensional freeze-thaw test method of closed system, taking water content and freeze-thaw cycle times as factors. The correlation between freeze-thaw effect of compressibility and freeze-thaw deformation is analyzed. The results show that the frost heaving ratio, thawing coefficient and compression coefficient increment of silt increase with the increase of freeze-thaw cycles, and change dramatically in the previous freeze-thaw cycles. The number of freeze-thaw cycles is related to the water content and increases with the increase of water content. The effect of freeze-thaw cycle increases with the increase of moisture content, and the effect of freeze-thaw cycle increases with the increase of moisture content, and the effect of freeze-thaw cycle increases with the increase of moisture content. Freezing and thawing cycles increase the effect of moisture content, and there is a good linear correlation between compression coefficient increment and freeze-thaw deformation rate. The results are in good agreement with the theoretical analysis. The results of the study are of great significance to the evaluation and prevention of freezing damage of sand soil foundation engineering in Ningxia winter irrigation area.
【作者单位】： 宁夏大学土木与水利工程学院;
【基金】：教育部“长江学者和创新团队发展计划”创新团队项目(IRT1067)资助
【分类号】：TV223
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本文编号：1562920