地下渗流对砂土热物性参数的影响程度分析  

Experimental Study on Seepage Effects on Determination of Thermal Properties of Sandy Soil

作　　者：程超杰[1] 骆进[1] 项伟[1] 贾海梁[1] 贾甲[2] 赵海丰[1,3] 

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074 [2]中国地质大学(武汉)教育部长江三峡地质灾害研究中心,湖北武汉430074 [3]长江三峡勘测研究院有限公司,湖北武汉430074

出　　处：《水电能源科学》2016年第12期152-155,149,共5页Water Resources and Power

基　　金：国家自然科学基金项目(41502238);中央高校杰出人才培育基金项目(CUGL150819)

摘　　要：在浅层地热能利用中,获取准确的岩土体热物性参数对地源热泵系统优化设计非常重要,但因原位测试常常受到地下水渗流的影响,导致所得参数不准确,从而使系统的设计浪费或失效。为此,设计了一套渗流控制系统,结合线热源测试原理,测试了长江一级阶地汉口地区的两种饱和砂土样在不同渗流速率下的热物性参数,并引入贝克来数评价了渗流作用对砂土传热性能的影响。结果表明,渗流对饱和砂土的热传导特性测试结果有明显的影响,且影响程度随渗流速率的增加而增强,对德国纽伦堡市一处地源热泵系统的测试亦验证了渗流对导热系数测试结果的增强作用。In utilization of shallow layer geothermal energy,the in-situ test results of thermal conductivity of rock-soil body is always affected by the groundwater seepage,which has a great influence on optimization design of ground source heat pump system.In this paper,a seepage control system is developed to test the thermal-physical parameters under different seepage flow velocity of two kinds of saturated sandy soil samples that are taken from the first terrace of the Yangtze River.The Péclet number is introduced to evaluate the impact of seepage on the heat transfer performance of sandy soil.The results indicate that the seepage has obvious impact on the heat transfer performance of saturated sandy soil,and the effects vary obviously with increase of flow velocity.An instance test in Nuremberg of Germany also verifies the results.

关 键 词：砂土 渗流 传热性能 热物性测试装置 定量评价 

分 类 号：TU411[建筑科学—岩土工程]