基于DTS技术的多层土有效导热系数测量方法  

Effective Thermal Conductivity Measurement for Multilayered Soil Using DTS Technology

作　　者：海那尔·别克吐尔逊 施斌[1] 曹鼎峰 魏广庆 HAINAR · Bektursen;SHI Bin;CAO Dingfeng;WEI Guangqing(School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China;Suzhou NanZee Sensing Technology Co. Ltd, Suzhou 215123, China)

机构地区：[1]南京大学地球科学与工程学院,江苏南京210023 [2]苏州南智传感科技有限公司,江苏苏州215123

出　　处：《防灾减灾工程学报》2018年第2期282-288,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金重点项目(41230636);国家重大科研仪器研制项目(41427801)资助

摘　　要：岩土体的导热系数是开发和利用地热能的重要参数。通过室内热响应模型试验,采用分布式温度传感技术（Distributed Temperature Sensing,DTS）,连续测得多层土模型饱和状态下4种常见土在试验中的有效导热系数分布和大小,分析了渗流对土有效导热系数的影响,并利用GeoStudio有限元软件对不同类型土的有效导热系数进行了模拟计算。试验和数值计算结果均表明：4种饱和土中有渗流的砂土的有效导热系数最大,无渗流砂土次之,粉土小于无渗流砂土,粘土小于粉土,有机质土的最小;渗流对砂土有效导热系数的结果影响显著,使有效导热系数增大了6倍。本试验采用DTS测试土的有效导热系数的方法可用于现场试验,所得结论为地热能开发和地源热泵设计提供了重要依据。The effective soil thermal conductivity of rock and soil is an important parameter in the development and utilization of geothermal energy.Based on laboratory thermal response model tests,the effective thermal conductivity of four common saturated soils were measured using Distributed Temperature Sensing（DTS）.The influence of seepage and soil types on effective thermal conductivity of soil was simulated by the finite element software GeoStudio.The experimental and numerical results show that the effective thermal conductivity of these four saturated soils is as follows：λ（sand（with seepage））λ（sand（without seepage））λ（silt）λ（clay）λ（organic） matter soil.The seepage has a large impact on effective thermal conductivity of soil.The effective thermal conductivity of soil increases up to 6 times under the impact of seepage.The method used in this paper can be used in field research as well.The conclusions provide basic knowledge for geothermal energy exploitation and ground source heat pump design.

关 键 词：多层土 有效导热系数 热响应试验 DTS 渗流 

分 类 号：TK124[动力工程及工程热物理—工程热物理]