含盐冻结粉质黏土应力-应变关系及强度特性研究  

Study of stress-strain relationships and strength characteristics of saturated saline frozen silty clay

作　　者：杨成松[1] 何平[2] 程国栋[1] 赵淑萍[1] 邓有生[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,兰州730000 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《岩土力学》2008年第12期3282-3286,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.40501016);中科院冻土工程国家重点实验室开放基金资助(No.SKLFSE200502);国家自然科学基金资助项目(No.40571068)资助

摘　　要：通过对含盐冻结粉质黏土进行三轴压缩试验,分析了该土质在加载至破坏过程中的应力-应变行为,并利用Duncan-Chang双曲线模型求得冻结盐渍粉质黏土的初始弹性模量和偏主应力的最大值。结果表明,初始弹性模量和偏应力最大值随着含盐量的减小和温度的降低而增加。为了分析含盐量对土体强度的作用机制,提出了"相对温度"这一概念,给出相对温度和抗压强度间的线性关系。以一综合指标"相对温度"来考虑盐分、试验温度等多种因素对冻土特性的影响,建立盐渍土和非盐渍土的关系,从而用非盐渍土的力学性质研究盐渍土的力学性质。According to results of the triaxial compressive test of saturated saline frozen silty clay, the stress-strain relationships are studied in the process from the beginning of test to the soil samples destroyed. And maximum values of initial elastic modulus and principal deviator stress are calculated by using Duncan-Chang hyperbolic model. The results show that the values of initial elastic modulus and principal deviator stress increase with salinity reducing and temperature falling. In order to analyze the action mechanism of salt content affecting on soil strength, a new concept, the relative temperature, is put forward, and the linear relationship of the relative temperature and the compressive strength are described. The relative temperature is an integrative conception to take into account how some elements, i. e. salinity, test temperature, etc, affect frozen soil characteristics, so as to express the relationship of saline soil and non-saline soil by the relative temperature. And the mechanical characteristics of saline soil is studied by it of non-saline soil.

关 键 词：盐渍土 冻结 应力-应变关系 抗压强度 相对温度 

分 类 号：TU411[建筑科学—岩土工程]