基于热探针测试的橡胶-砂颗粒轻质混合填料导热系数影响因素研究
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摘要
导热系数是岩土材料热学特性的一个重要参数,文章对橡胶-砂颗粒混合物的进行了大量的热针试验。详细分析含砂率、含水率和干密度对导热系数的影响。结果表明:当含砂量小于20%时,橡胶-砂混合物的导热系数逐渐增加,但砂粒含量超过80%后,导热系数立即出现较高的增加速率;随着干密度的增加,导热系数在低含砂率时呈现抛物线增长,在高含砂率时呈现线性增长;橡胶-砂混合物导热系数随含水率的变化可分为增长区域和稳定区域,6%含水率可作为临界含水率。该文可为地热相关结构周围的轻质回填材料提供更合理的热学参数,此外,废旧轮胎的有效利用可以减少环境污染,促进可持续的基础设施。
Thermal conductivity is an important parameter of the thermal properties of geotechnical materials, the rubber sand mixture is studied by a large number of hot needle test. The influence of sand content, water content and dry density on thermal conductivity is analyzed in detail. The test results show that when the sand content is less than 20%, the thermal conductivity of rubber mixture sand increased gradually, but the sand content is more than 80%, the thermal conductivity immediately higher rate of increase; with the increase of the dry density,thermal conductivity of growth in low sand rate shows a linear growth in the present, with a high rate of sand when the oak; Changes of rubber sand mixture thermal conductivity and water content can be divided into growth region and stability, 6% moisture content can be used as the critical moisture content. The study can provide thermal parameters, a more reasonable light around geothermal related structure backfill material in addition,effective utilization of waste tires can reduce environmental pollution and promote sustainable infrastructure.
Thermal conductivity is an important parameter of the thermal properties of geotechnical materials, the rubber sand mixture is studied by a large number of hot needle test. The influence of sand content, water content and dry density on thermal conductivity is analyzed in detail. The test results show that when the sand content is less than 20%, the thermal conductivity of rubber mixture sand increased gradually, but the sand content is more than 80%, the thermal conductivity immediately higher rate of increase; with the increase of the dry density,thermal conductivity of growth in low sand rate shows a linear growth in the present, with a high rate of sand when the oak; Changes of rubber sand mixture thermal conductivity and water content can be divided into growth region and stability, 6% moisture content can be used as the critical moisture content. The study can provide thermal parameters, a more reasonable light around geothermal related structure backfill material in addition,effective utilization of waste tires can reduce environmental pollution and promote sustainable infrastructure.
引文
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[12]Li C Y,Liu H B,Wei H B.An experimental study on engineering properties of rubber particles-improved fly ash soil[J].Applied Mechanics and Materials,2011,71-78:3401-3406
[2]张涛,蔡国军,刘松玉,等.橡胶-砂颗粒混合物强度特性及微观机制试验研究[J].岩土工程学报,2017,39(6):1082-1088(Zhang Tao,Cai Guojun,Liu Songyu,et al.Experimental study on strength characteristics and micro-mechanism of rubber-sand mixtures[J].Chinese Journal of Geotechnical Engineering,2017,39(6):1082-1088(in Chinese))
[3]辛凌,刘汉龙,沈扬,等.废弃轮胎橡胶颗粒轻质混合土强度特性试验研究[J].岩土工程学报,2010,32(3):428-433(Xin Ling,Liu Hanlong,Shen Yang,et al.Consolidated undrained triaxial compression tests on lightweight soil mixed with rubber chips of scrap tires[J].Chinese Journal of Geotechnical Engineering,2010,32(3):428-433(in Chinese))
[4]辛凌,刘汉龙,沈扬,等.废弃轮胎橡胶颗粒轻质混合土无侧限抗压强度试验[J].解放军理工大学学报:自然科学版,2010,11(1):79-83(Xin Ling,Liu Hanlong,Shen Yang,et al.Study on unconfined compressive test of lightweight soil mixed with rubber chips of scrap tires[J].Journal of PLA University of Science and Technology:Natural Science Edition,2010,11(1):79-83(in Chinese))
[5]孔德森,陈文杰,贾腾,等.动荷载作用下RST轻质土变形特性的试验研究[J].岩土工程学报,2013,35(S2):874-878(Kong Desen,Chen Wenjie,Jia Teng,et al.Deformation characteristics of RST lightweight soils under dynamic loads[J].Chinese Journal of Geotechnical Engineering,2013,35(S2):874-878(in Chinese))
[6]史旦达,周健,贾敏才,等.考虑颗粒破碎的砂土高应力一维压缩特性颗粒流模拟[J].岩土工程学报,2007,29(5):736-742(Shi Dadan,Zhou Jian,Jia Mincai,Yan et al.Numerical simulations of particle breakage property of sand under high pressure 1D compression condition by use of particle flow code[J].Chinese Journal of Geotechnical Engineering,2007,29(5):736-742(in Chinese))
[7]Cai Guojun,Zhang Tao,Puppala A J,et al.Thermal characterization and prediction model of typical soils in Nanjing area of China[J].Engineering Geology,2015,191:23-30
[8]Zhang Tao,Cai Guojun,Liu Songyu,et al.Investigation on thermal characteristics and prediction models of soils[J].International Journal of Heat and Mass Transfer,2017,106:1074-1086
[9]Yoon Y W,Heo S B,Kim K S.Geotechnical performance of waste tires for soil reinforcement from chamber tests[J].Geotextiles and Geomembranes,2008,26(1):100-107
[10]Youwai S,Bergado D T.Strength and deformation characteristics of shredded rubber tire sand mixtures[J].Canadian Geotechnical Journal,2003,40(2):254-264
[11]Senetakis K,Anastasiadis A,Pitilakis K.Dynamic properties of dry sand/rubber(SRM)and gravel/rubber(GRM)mixtures in a wide range of shearing strain amplitudes[J].Soil Dynamics and Earthquake Engineering,2012,33(1):38-53
[12]Li C Y,Liu H B,Wei H B.An experimental study on engineering properties of rubber particles-improved fly ash soil[J].Applied Mechanics and Materials,2011,71-78:3401-3406