量热法与测温法在冻土未冻水测试中的应用  

Application of Thermometric Method and Calorimetric Method in the Measurement of Unfrozen Water in Frozen Soil

作　　者：冷毅飞[1] 孙友宏[1] 杨凤学[2] 姜龙[2] 赵意民[2] 

机构地区：[1]吉林大学建设工程学院,长春130026 [2]大庆油田工程有限公司,黑龙江大庆163712

出　　处：《吉林大学学报（地球科学版）》2011年第2期478-483,497,共7页Journal of Jilin University：Earth Science Edition

基　　金：中俄原油管道工程多年冻土勘察测试研究项目(20070808)

摘　　要：冻土未冻水含量不但是评价冻土中水分迁移特性的重要指标,而且也是冻土热工计算中常用的参数。分别对量热法与测温法的原理进行分析,指出测温法原理中存在混淆温度概念的问题。量热法可以测定土样任一含水量任一负温条件下的未冻水含量,而测温法试验曲线中查得的数据仅是某一冻结起始温度对应的初始含水量,不能反映冻土中未冻水含量随温度的变化规律。选取2种细粒土料配置6种不同含水量土样进行了2种方法的对比试验和测温法中土的起始冻结温度的平行试验。试验结果表明,由测温法确定未冻水含量具有不可靠性。建议在试验条件允许的情况下,使用量热法进行冻土未冻水含量的检测。Unfrozen water content is not only an important evaluation index of water migration in frozen soils,but also a common parameter in thermotechnical calculation.The principles of two unfrozen water measurement methods are analyzed respectively,which are temperature measurement method and calorimetric method,and some problems on principle of temperature measurement method are put forward.Unfrozen water content at any temperature can be obtained by calorimetric method,while by temperature measurement method it can only get the initial water content at its initial freezing temperature,as the curve can not reflect the unfrozen water variation with temperature.The contrast test of the two methods are carried out using six samples which contains different water content.The results show that there is a uncertainty in the result obtained by temperature measurement method.Therefore the calorimetric method is suggested to use if the test condition permitted.

关 键 词：未冻水 测温法 量热法 含水量 

分 类 号：TU445[建筑科学—岩土工程]