影响北京地区粉质粘土和细砂的热导率因素统计分析  

Statistical Analysis of Factors Affecting the Thermal Conductivity of Silty Clay and Fine Sand in Beijing Area

作　　者：栾英波[1] 卫万顺[1] 郑桂森[1] 季鑫楠[2] 

机构地区：[1]北京市地质矿产勘查开发局,北京100195 [2]北京市地质调查研究院,北京100195

出　　处：《现代地质》2011年第6期1187-1194,共8页Geoscience

基　　金：北京市地质矿产勘查开发局"北京市优秀人才培养资助"计划项目(2010D00201100000);北京平原区浅层地温能资源地质勘查项目(2006-000-043289)

摘　　要：随着能源短缺和人们环保意识不断提高,浅层地下空间的有限资源得到了快速开发利用,为高效合理使用地下有限热能,有必要研究岩土体的热物理参数变化规律。在北京平原区浅层地温能资源地质勘查项目岩土体热物理性质测试和土工试验的基础上,对粉质粘土和细砂的热导率影响因素进行数理统计分析。从统计结果来看,在天然含水率条件下,粉砂质粘土的平均热导率为1.74 W/(m.K),细砂的平均热导率为1.55 W/(m.K),两者的热导率均随天然含水率、天然密度、孔隙比的变化趋势明显:随着含水量的增大而热导率逐渐减小,随密度的增加而热导率增大,随着孔隙度的增加则热导率逐渐降低,粉质粘土含水量在20%左右热导率最佳,细砂含水量在15%左右热导率最佳;由于样品物质成分和微观结构差异影响传热方式组合,因而导致不同地区乃至相同地区热导率与含水量等因素拟合方程形式不尽相同,但变化规律趋势相似。With shortages of energy and increasing awareness of environmental protection,the limited resources of shallow underground space have been rapidly developed and utilized.It is very important to master the variation of thermal physical parameters of rock and soil for using limited underground thermal energy efficiently and reasonably.Based on the thermal physical properties test of rock and soil in the geological prospecting projects of Beijing plain shallow geothermal energy resources,this paper analyses statistically the factors affecting the thermal conductivity of the silty clay and fine sand.The statistical results show that the average thermal conductivity of silty clay is 1.74 W/（m · K）,and the average thermal conductivity of fine sand is 1.55 W/（m · K） and that the variation trend of these thermal conductivity rates is clear with the variation of the natural water content,natural density and porosity,with increasing water content the thermal conductivity decreases.The variation trends are listed as following： the thermal conductivity increases with increasing density;the thermal conductivity reduces with increasing porosity;the best thermal conductivity is of about 20% water content in silty clay and 15% in fine sand;because the differences of samples in geological structural position,sedimentary environment,sedimentary history,material composition of rock and soil and composition microstructure affect the combination of the heat transfer,the thermal conductivity and water content in different areas,even in the same areas,have different fitting equations but the same variation trend.

关 键 词：粉质粘土 细砂 热物理性质 天然含水率 北京地区 

分 类 号：P642.13[天文地球—工程地质学]