分凝势评价土体冻胀敏感性的有效性验证  

Validity Verification of the Segregation Potential in Evaluating the Sensitivity of Soil Frost Heave

作　　者：周佳伟 林春梅[2] 张驱 ZHOU Jiawei;LIN Chunmei;ZHANG Qu(College of Civil Engineering,Fuzhou University,Fuzhou 350116;Tianjin Municipal Engineering Design and Research Institute,Tianjin 300392;Guangzhou Yuchen Information Technology Co.,Ltd.,Guangzhou 510000)

机构地区：[1]福州大学土木工程学院,福州350116 [2]天津市市政工程设计研究院,天津300392 [3]广州誉宸信息科技有限公司,广州510000

出　　处：《土工基础》2020年第4期487-489,496,共4页Soil Engineering and Foundation

摘　　要：冻胀率作为常规的冻胀评价指标,只能预估土体的冻胀变形。为了较好的评价土体的冻胀性,验证分凝势模型能否有效的评价土体的冻胀敏感性,基于室内冻胀试验,实测土体冻结过程中的温度场和冻胀变形。依据Konrad模型计算分凝势;分析了分凝势随冻结时间的发展规律、分凝势与冻胀变形和冻胀速率的关系。研究表明:单向冻结条件下,饱和粉质黏土冻结过程中的分凝势与冻胀变形和冻胀速率具有较好的正相关性。分凝势可以有效评价土体的冻胀敏感性,表征冻土的变形趋势和冻胀程度。Frost heave rate,as a conventional frost heave index,can only estimate the frost heave deformation of soils.In order to better evaluate the frost heave property of the soil and verify whether the segregation potential model can effectively evaluate the frost heave sensitivity of the soil,the temperature distribution and deformation development of the soil during the freezing process are measured under the laboratory conditions.The segregation potential is then calculated according to the model proposed by Konrad.The relationship between the segregation potential and the freezing time,the segregation potential and the frost heave deformation and the frost heave rate are analyzed.The studies show that the segregation potential of the saturated silty clay has a good positive correlation with the frost heave deformation and frost heave rate under the one-dimension freezing condition.The segregation potential can effectively evaluate the frost heave sensitivity of the soil and can characterize the degree and trend of frost heave.

关 键 词：冻土 冻胀 冻胀敏感性 分凝势 

分 类 号：TU411[建筑科学—岩土工程]