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岩土体热物理性质是当前岩土工程领域的一个重要研究课题,其关键在于岩土体导热系数的测试。使用日本EKO公司HC-110型热导仪,应用稳态法对南京地区典型下蜀土的击实重塑样进行导热系数测试,分析含水率、密度及试验温度对土体导热系数的影响,从土颗粒间、土颗粒与水分子间的接触方式对不同物理指标下土的导热系数的影响机制进行机理分析,结果表明:含水量一定,试样密度越大,土颗粒之间接触面积越大,土体热交换能力越强,导热系数越大;试样密度一定,温度升高时水分子活动能力加剧,导热系数随温度升高而增大,含水量大于16.6%时,导热系数随温度变化趋于平缓,温度大于50℃时导热系数有变小的趋势;试验温度一定,含水量小于20%时导热系数增大明显,含水量超过20%时试验值变化范围较小且有曲线重合现象。
The thermal physical properties of rock and soil body is an important research topic in the field of geotechnical engineering. The key point lies in the test of thermal conductivity of rock and soil. The thermal conductivity of concrete compacted remnant sample of typical sauron soil in Nanjing area was measured by steady state method using HC-110 thermal conductivity meter from Japan EKO Company. The influence of moisture content, density and test temperature on thermal conductivity of soil was analyzed. The mechanism of the thermal conductivity of soils under different physical indexes is analyzed from the contact between soil particles and soil particles and water molecules. The results show that the contact area between soil particles is larger when the water content is constant and the density of sample is larger The thermal conductivity of the soil increases with the increase of the temperature. When the water content is more than 16.6%, the thermal conductivity increases with the increase of the temperature. With the increase of the temperature, The temperature tends to be gentle, and the thermal conductivity tends to decrease when the temperature is higher than 50 ℃. When the temperature is constant, the thermal conductivity increases obviously when the water content is less than 20%, and the range of the test value is small with the curve Coincidence phenomenon.