压实黄土导热系数的试验研究

Experimental Study on the Thermal Conductivity of Compacted Loess

随着当今土建工程的不断发展,越来越多的地上空间将被消耗殆尽。地下空间的开发利用将是城市建设中的重点领域。而随着现在工程当中大量填土的应用,这就使得在地下工程建设时难免遇到压实填土;而土的热物理性质又是岩土地下工程建设设计中必不可少的设计参数。通过室内试验测试了不同击实功条件下、不同击实含水量的压实黄土试样的导热系数值。试验结果表明,压实黄土的导热系数与其击实含水量、干密度、孔隙比、饱和度等具有明显的相关性。在击实能一定的条件下,导热系数随土样的击实含水量的增加而增加,达到峰值后又随着含水量的增大而下降,随孔隙比的降低而增加,随着密度的增大而增大。导热系数较大值几乎都出现在压实土体较密实状态下。

With the continuous development of civil engineering, more and more land space will be exhausted. Development and utilization of underground space in urban construction will be the focus areas. With a large number applications of filling soil in present engineering, that allow inevitably encounter compacted filling soil in underground construction, the thermo-physical properties of the soil is the essential design parameters of underground geotechnical engineering construction design. Test compacted loess samples＇ thermal conductivity under different conditions of compaction energy, different compaction water content are through laboratory experimented. The results show that, thermal conductivity of compacted loess has obvious relevance with its compaction water content, dry density, void ratio, degree of saturation. At same compaction work condition, thermal conductivity of soil in- creases first, reaches a peak, then decreases with the increase of compaction water content. Thermal conductivity of soil normally increases with the decrease of void ratio and increase of density.