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利用QTM-D2常温导热系数测定仪测定了典型砂、黏土、岩石的导热特性,探讨了室内外试验、试样饱和程度对测量结果影响,通过试验结果和数值模拟研究了不同试样导热系数的尺寸差异,为现场岩土材料导热系数的测定提出了可行的解决方案。热线法测量时,试件尺寸影响范围不大,不同几何尺寸边界的测量结果很接近。根据国内外对导热系数的温度影响问题的研究实际,通过大量的实测数据和数值理论计算,总结了常温条件范围内各类岩土材料导热系数与温度之间的经验关系以及它们的温度变异影响系数β。各类岩土材料的β值普遍较小,大多在10-3的数量级上,导热系数与温度关系曲线近线性。该系数和这些经验公式的导出对中国北方地区岩土材料导热性能的理解及温度场模拟工作均具重要意义。
The thermal conductivity of typical sand, clay and rock were measured by using QTM-D2 room-temperature thermal conductivity meter. The effects of indoor and outdoor tests and sample saturation on the measurement results were discussed. The thermal conductivity of different samples was studied by the experimental results and numerical simulation Dimensional differences, the feasibility of the solution for the determination of the thermal conductivity of geomaterials in the field. When measured by hot wire method, the influence of specimen size is not large, and the measurement results of different geometric size boundaries are very close. According to the actual research on the influence of temperature on the thermal conductivity both at home and abroad, the empirical relationship between the thermal conductivity and the temperature of all kinds of geomaterials under normal temperature conditions and the influence of their temperature variation are summarized through a large number of measured data and numerical calculation. Coefficient β. The β values of various types of geomaterials are generally small, mostly in the order of 10-3, and the thermal conductivity is nearly linear with temperature. This coefficient and the derivation of these empirical formulas are of great significance for understanding the thermal conductivity of geomaterials in northern China and for simulating the temperature field.