冻融循环作用下土体冻结锋面移动规律试验研究
发布时间：2018-12-16 09:19
【摘要】：冻融循环作用改变了土体结构及热物理性质,进而影响了土体温度变化过程,土体冻结锋面的稳定位置也随之变化.为研究冻融循环作用下土体冻结锋面的移动规律,进行了开放系统下的兰州黄土冻融循环试验.试验结果表明:冻结初期冻结锋面迅速下移,冷端温度稳定后其下移速度降低,当土体温度达到平衡时,冻结锋面位置趋于稳定;冻结锋面稳定深度随冻融循环次数的增加而增加.为阐述黄土冻结锋面随着时间变化规律,采用时间比拟法得到了冻融循环次数与冻融时间相似比拟曲线.由拟合曲线得第6次冻融循环后土体冻结锋面稳定在土样高度24.4 mm处,实测稳定在24.3 mm处,相对误差为0.4%.
[Abstract]:The freezing and thawing cycles change the soil structure and thermo-physical properties, and then affect the soil temperature change process, and the stable position of the soil freezing front also changes. In order to study the moving law of soil freezing front under freeze-thaw cycle, the freeze-thaw cycle test of Lanzhou loess under open system was carried out. The experimental results show that the freezing front moves down rapidly at the initial freezing stage, and the velocity decreases after the cold end temperature stabilizes. When the soil temperature reaches equilibrium, the freezing front position tends to be stable. The stable depth of freezing front increases with the increase of freeze-thaw cycles. In order to expound the law of loess freezing front changing with time, the similar analogy curve between freezing and thawing times and freeze-thaw time was obtained by using time analogy method. According to the fitting curve, the freezing front of the soil after the sixth freeze-thaw cycle is stable at 24.4 mm of soil sample height, and the measured value is 24.3 mm, the relative error is 0.4.
【作者单位】： 中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室;中国科学院大学;
【基金】：国家重点基础研究发展计划项目(2012CB026102) 国家自然科学基金项目(41271080) 冻土工程国家重点实验室项目(SKLFSE-ZQ-35) 中国科学院西部行动计划项目(KZCX2-XB3-19)资助
【分类号】：P642.14
，
本文编号：2382124
[Abstract]:The freezing and thawing cycles change the soil structure and thermo-physical properties, and then affect the soil temperature change process, and the stable position of the soil freezing front also changes. In order to study the moving law of soil freezing front under freeze-thaw cycle, the freeze-thaw cycle test of Lanzhou loess under open system was carried out. The experimental results show that the freezing front moves down rapidly at the initial freezing stage, and the velocity decreases after the cold end temperature stabilizes. When the soil temperature reaches equilibrium, the freezing front position tends to be stable. The stable depth of freezing front increases with the increase of freeze-thaw cycles. In order to expound the law of loess freezing front changing with time, the similar analogy curve between freezing and thawing times and freeze-thaw time was obtained by using time analogy method. According to the fitting curve, the freezing front of the soil after the sixth freeze-thaw cycle is stable at 24.4 mm of soil sample height, and the measured value is 24.3 mm, the relative error is 0.4.
【作者单位】： 中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室;中国科学院大学;
【基金】：国家重点基础研究发展计划项目(2012CB026102) 国家自然科学基金项目(41271080) 冻土工程国家重点实验室项目(SKLFSE-ZQ-35) 中国科学院西部行动计划项目(KZCX2-XB3-19)资助
【分类号】：P642.14
，
本文编号：2382124
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