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土的温度效应是岩土工程领域的热点问题,但对于100℃以上高温环境下土的物理性能的研究并不多。详细介绍了自行研制的高温加热试验装置,并利用该设备测定了上海软黏土样在105℃,120℃,150℃和200℃等高温加热2.5h和4.0 h后的体积变化、干密度和饱和度的变化,测定了105℃,150℃和200℃下恒温4.0 h土的导热情况。试验结果表明土样的体积和饱和度均随温度增加而减小,土样的干密度随温度的增加而增加,且随加热时间增加变化趋缓;湿土和干土的导热系数均随温度升高而增大,且干土的导热系数小于湿土的导热系数。说明软黏性土在100℃以上高温环境作用下会出现塑性变形和加热硬化现象,高温对土的导热系数影响显著。
Soil temperature effect is a hot issue in the field of geotechnical engineering. However, there are not many studies on the physical properties of soils at high temperature above 100 ℃. The high temperature heating test device developed by ourselves was introduced in detail. The volume change, dry density and saturation of Shanghai soft clay samples heated at 105 ℃, 120 ℃, 150 ℃ and 200 ℃ for 2.5 h and 4.0 h were measured. The thermal conductivity of 4.0 h soil at 105 ℃, 150 ℃ and 200 ℃ was measured. The results showed that the volume and saturation of soil samples decreased with the increase of temperature. The dry density of soil samples increased with the increase of temperature, and decreased with the increase of heating time. The thermal conductivity of both wet and dry soil varied with temperature Increase and increase, and the thermal conductivity of dry soil is less than the thermal conductivity of wet soil. It shows that plastic clay will appear plastic deformation and heat hardening phenomenon under high temperature above 100 ℃. High temperature has a significant influence on soil thermal conductivity.