人工侧向冻结条件下土的冻结试验

在人工侧向冻结、正弦和恒温2种冻结温度、开放和封闭条件下，对含水率为32 %的重塑粉质黏土进行了4组冻结试验。结果表明，补水条件相同时侧向正弦冻结试样的冻结速度比封闭正弦冻结试验的缓慢，当其冻结状态进入稳态之后，试样的整体温度场随着侧向冻结温度的正弦变化而出现相应的波动，但径向各段的温度梯度的相位滞后于正弦温度相位半个周期；正弦冻结试样与恒温冻结试样在同一条件下的冻胀量相近，封闭体系下自上而下轴向冻结试样的冻胀量高于同条件下侧向冻结试样的冻胀量；人工冻结工程中应考虑大气环境温度变化（如昼夜温差）及冷能侧向输入土体内时对冻土温度场的变化的影响。

Test analysis of disturbed soil by lateral artificial freezing

Four laterally artificial freezing experiments on disturbed silty clay with water content of 32 % are carried on under the conditions of sine-varying or constant freezing temperature models, with or without water supply. The results show that the laterally freezing velocity of sine-temperature freezing sample is relatively slower than that with constant-temperature freezing. When the freezing state of the sine-freezing samples is relatively steady, the whole temperature field varies with the sine variation of the freezing temperature. The phases of temperature gradients of sine-freezing samples, in the radial direction, lags the phase of the sine-freezing temperature in half period. The frost heave amount of the sine-freezing samples is nearly as much as that of the constant-freezing samples under the same test conditions. Without water supply, the amount of frost heave of the axial-freezing(from top to bottom) sample is larger than that of the one under the same experimental conditions. The impact of the atmosphere temperature (e.g. diurnal amplitude) should be taken into consideration, while lateral-artificial ground freezing is applied.