Question

英语翻译冻土的物理、力学和热学性质均与温度密切相关.就热学而言,热收支是衡量自然冻土和冻土区各种工程稳定性的重要指标.目

Answer 1

The physical, mechanical and thermal properties of the permafrost are closely linked with temperature. In terms of thermal property, heat budget is an important indicator to measure the stability of natural permafrost and that of projects in permafrost regions. At present, the heat budget is mainly gained by calculating the heat flow through the active layer with the thermal conductivity. The heat flux between 0.5 and 1.0 m depths under the natural ground and that under the embankment (center hole) were calculated and compared (Sheng et al., 2002, 2003a). The heat flux through insulation board was gained with time quadrature of the temperature curves above and below the insulation board and the thermal conductivity of the board (Sheng et al., 2003b). The heat flux between 0.2 and 0.7 m depths under block-rock layer and that under crushed stone layer was compared, and proved that the cooling effect under block-rock layer is better (Sun et al., 2004). The heat flow between 2.5 and 3.0 m depths under duck-ventilated embankment was calculated (Niu et al., 2003). It was deduced that the ratio of difference in temperature equals to the heat radio in its experimental conditions, and the effect of auto-temperature-controlled ventilation embankment and ordinary ventilation embankment was compared (Yu et al., 2004). The layer between 3.0 and 3.5 m depths was selected to calculated heat budget, of which was constituted with thermal stable soil-poor ice, and the heat budget and heat flux of auto-temperature-controlled ventilation embankment and ordinary ventilation embankment was compared (Yu et al., 2009). The heat budget between 0.5 and 1.0 m depths under block-rock layer embankment was analyzed (Wu et al., 2005, 2008). With comparing the heat flux and heat budget between the natural permafrost and that of the embankment, the uplift of the permafrost table was explained after embankment construction (Yu et al., 2009).