Experimental analysis of horizontal frost heaving force of loess in Lanzhou City of Gansu Province Area
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摘要:
为研究不同含水率黄土在一维冻结融化过程中温度场和水平冻胀力的变化特征规律，选取兰州地区黄土进行了封闭系统下的一维冻结融化试验。研究结果表明：土体的降温过程分为四个阶段，降温冻结初期各深度土体的温度下降速率较快；土体温度下降到0.4 ℃时降温曲线出现转折点，土层各深度降温速曲线出现近乎平行于横坐标的平稳段；冻结后期各深度土体的温度下降速率较慢。最大水平冻胀力沿着土体深度先是稳定变化较为小，然后增大到最大值最后减小。水平冻胀力最大值随含水率有很明显的变化，含水率越高水平冻胀力越大，而其他值的大小受含水率的影响较小，水平冻胀力最大值出现在相对深度0.6～0.8处。
Abstract:In order to study the variation of temperature field and horizontal frost heaving force during the one-dimensional freezing and melting process of loess with different water content, the one-dimensional freezing and melting test under closed system was carried out on the loess from Lanzhou Area. The results show that the cooling process of the soil can be divided into four stages. The temperature drop rate of the soil at each depth is faster when the temperature is frozen. When the temperature drops to 0.4 ℃, the cooling curve shows a turning point, and the depth of the soil decreases. A plateau that is nearly parallel to the abscissa; the temperature of the soil at each depth is slower at the late stage of freezing. The maximum horizontal frost heaving force changes little along the soil depth, then increases to the maximum and finally decreases. The maximum value of horizontal frost heaving force changes obviously with the water content. The higher the water content is, the greater the horizontal frost heaving force is, while the other values are less affected by the water content. The maximum value of horizontal frost heaving force appears at the relative depth of 0.6 to 0.8.
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Key words:
- horizontal frost heave force /
- model test /
- frozen soil /
- temperature field /
- frost heave
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表 1 黄土基本物理指标
Table 1. Basic physical properties of loess
比重
Gs液限
wL/%塑限
wp/%塑性指数
Ip最优含水率
wopc/%最大干密度
ρdmax/(g·cm−3)2.71 28.38 15.21 13.17 13.6 1.89 
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