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研究了不同实验条件下原状和扰动粉黏土人工冻胀速率的发展特点,并对试验结果进行了对比分析。同时还分析、总结了各种试验因素对人工冻胀速率的影响。针对粉黏土冻胀速率的研究,共进行了12组人工冻结试验,试验中所采用的各种影响因素如下:两种人工冻结冷端温度模式——正弦变化冻结温度和恒定冻结温度,三个不同人工冻结方向——竖向冻结、侧向冻结以及复合冻结(竖向—侧向冻结),不同含水率——23.5%、28%和32%,不同水分补给条件——开放体系和封闭体系。试验结果表明:季节冻土层的存在将减少或是抑制由人工冻结所引起的二次冻胀的发展。研究结果将为人工冻结实际工程,特别是在季节冻土区的人工冻结工程提供重要的理论指导。
The development characteristics of artificial frost heave rate of undisturbed and disturbed pulverized clays under different experimental conditions were studied and the experimental results were compared and analyzed. At the same time, it also analyzes and summarizes the influence of various test factors on artificial frost heaving rate. In order to study the frost heaving rate of the powdered clay, a total of 12 groups of artificial freezing experiments were carried out. The various influencing factors used in the experiment are as follows: Two types of artificial freezing cold junction temperature modes - sinusoidal freezing temperature and constant freezing temperature, three Different artificial freezing direction - vertical freezing, lateral freezing and composite freezing (vertical - lateral freezing), different moisture content - 23.5%, 28% and 32%, different water replenishment conditions - open system and closed system . The experimental results show that the existence of seasonal frozen soil layer will reduce or inhibit the development of secondary frost heave caused by artificial freezing. The results of the study will provide important theoretical guidance for the artificial freezing of practical projects, especially in artificial freezing of seasonal frozen areas.