【摘要】 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。更多还原

【Abstract】 The developing characteristics of rate of frost heave of silty clay(undisturbed and disturbed) by artificial freezing are revealed,and different experimental results are compared.The influence of diverse experimental parameters on the rate of frost heave is analyzed and concluded.12 artificial freezing tests are performed on silty clay samples for this investigation,and the experimental parameters consist of two kinds of cooling temperature models for artificial freezing(sine-varying and constant),three kinds of freezing directions(vertical freezing,lateral freezing and vertical-lateral freezing),and different water contents(23.5%,28% and 32%),with or without water supply.It is significantly concluded that the existence of seasonal frozen layer will reduce or suppress the second frost heave caused by artificial ground freezing in the engineering projects.This study will provide significant instruction for the construction of artificial ground freezing,especially in seasonally frozen ground.更多还原