非饱和黄土物理力学参数与导热系数关系的研究
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摘要
为了研究黄土导热性能与其物理力学参数之间的关系,文章对宁东黄土进行了导热系数、标准贯入试验及含水率、密度等参数的测试,对测得的数据进行了拟合及相关性分析,讨论了不同参数与导热系数的关系。试验结果表明,非饱和黄土中的气体和孔径是影响导热系数的关键。土越密实,含水率越高,土中气体的体积越小,导热系数越大;孔径越小,导热系数越大。非饱和黄土强度越高,其导热性能不一定越好。含水率、密度、干密度、饱和自重压力、液性指数、粘聚力、压缩系数和标准贯入等指标与导热系数有显著的相关性,可以很好的评价黄土的导热性能。
In order to study the relationship between the thermal conductivity of loess and its physical mechanical parameters,we test the thermal conductivity,standard penetration test and density of loess in Ningdong area,and the measured data is simulated. The correlation analysis of relationship between different parameters and thermal conductivity are discussed. The experimental results show that moisture content,density,dry density,saturated self-weight pressure,liquid index, cohesion, and standard penetration have significant correlation with thermal conductivity, which can evaluate the thermal conductivity of loess approximately. The gas and pore size in unsaturated loess are the critical factors to the thermal conductivity. The denser soil,the higher moisture content,the smaller volume of gas in the soil,and there is the greater thermal conductivity. The smaller aperture,and there is the greater thermal conductivity. With the increasing of soil strength,its thermal conductivity is not necessarily good.
In order to study the relationship between the thermal conductivity of loess and its physical mechanical parameters,we test the thermal conductivity,standard penetration test and density of loess in Ningdong area,and the measured data is simulated. The correlation analysis of relationship between different parameters and thermal conductivity are discussed. The experimental results show that moisture content,density,dry density,saturated self-weight pressure,liquid index, cohesion, and standard penetration have significant correlation with thermal conductivity, which can evaluate the thermal conductivity of loess approximately. The gas and pore size in unsaturated loess are the critical factors to the thermal conductivity. The denser soil,the higher moisture content,the smaller volume of gas in the soil,and there is the greater thermal conductivity. The smaller aperture,and there is the greater thermal conductivity. With the increasing of soil strength,its thermal conductivity is not necessarily good.
引文
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[18]邓亮章.最小二乘法的拟合及其应用[J].兰州教育学院学报,2012,28(8):109-110,131.
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[20]赵文文.黄土物理力学参数与导热系数的关系及其统计中存在问题的研究[D].西安:长安大学,2017.
[21]赵安平.季冻区路基土冻胀的微观机理研究[D].吉林:吉林大学,2008.
[22]张昭,刘奉银,张国平,等.不等径湿颗粒与液桥相互作用的微观水力特性[J].水利学报,2013,44(7):810-817.
[23]刘嘉麒,钟华,刘东生.渭南黄土中温室气体组分的初步研究[J].科学通报,1996(24):2257-2260.
[2]刘鹏,阎长虹,徐杨,等.南京地区下蜀土导热系数影响因素室内试验研究[J].防灾减灾工程学报,2016(5):847-852.
[3]朴春德,王东,李亭.岩质边坡相似材料导热系数的试验研究[J].工程地质学报,2015(5):821-826.
[4]王军刚,胡爱娟,徐帮耀,等.影响岩土导热系数测试准确性的因素分析[J].建筑热能通风调,2015(4):14-17.
[5]申向梁.中俄原油管道多年冻土导热系数测试方法及比较研究[D].吉林:吉林大学,2015.
[6] Zhuravlev Igor Igorevich,Motenko Rimma Grigoryevna. The oil contamination influence on heat transfer in frozensoils[J].Journal of Glaciology and Geocryology,2004,26(Supp. 1):128-132.
[7] Nicolsky D J,Romanovsky V E,Panteleev G G. Estimation of soil thermal properties using insitu-temperature measurements in the active layer and permafrost[J]. Cold Regions Science and Technology,2009,55(1):120-129.
[8] EPRI. 1989.(Bose,J. E. Editor)Soil and Rock Classification for the Design of Ground-Coupled Heat Pump Systems Fied Manual. Electric Power Research Institute Special Report,EPRI CU-6600.
[9] Austin W. A. Development of an Insitu System for Measuiing Ground Thermal Properties, Master of Science Thesis, 1998,Oklahoma State University,Stillwater,Oklahoma.
[10]俞亚南,徐坚,冯建江.粉性土导热系数的室内实验研究[J].浙江大学学报(工学版),2010(1):180-183.
[11]李兴柏,李国玉,毕贵权,等.石油污染土体导热系数变化规律和变化机制[J].地下空间与工程学报,2011(6):1114-1120.
[12]张婷,杨平.不同因素对浅表土导热系数影响的试验研究[J].地下空间与工程学报, 2012, 8(6):1233-1238.
[13]王铁行,刘自成,卢靖.黄土导热系数和比热容的实验研究[J].岩土力学,2007,28(4):655-658.
[14]黄犊子,樊栓狮.采用HOTDISK测量材料热导率的实验研究[J].化工学报,2003(S1):67-70.
[15] Yi He. Rapid thermal conductivity measurement with a hotdisk sensor[J]. Thermochimica Acta,2005(436):122-129.
[16] GBSL237-1999,土工试验规程[S].
[17]汪荣鑫.数理统计[M].西安:西安交通大学出版社,1986.
[18]邓亮章.最小二乘法的拟合及其应用[J].兰州教育学院学报,2012,28(8):109-110,131.
[19]张凤菊,刘晓娟,赵丽平,等.数据差异显著性检验[J].农机使用与修,2012(4):51-52.
[20]赵文文.黄土物理力学参数与导热系数的关系及其统计中存在问题的研究[D].西安:长安大学,2017.
[21]赵安平.季冻区路基土冻胀的微观机理研究[D].吉林:吉林大学,2008.
[22]张昭,刘奉银,张国平,等.不等径湿颗粒与液桥相互作用的微观水力特性[J].水利学报,2013,44(7):810-817.
[23]刘嘉麒,钟华,刘东生.渭南黄土中温室气体组分的初步研究[J].科学通报,1996(24):2257-2260.