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初始温度场采用实测温度场,相应的物理参数通过实测地温数据用有限元方法反演得到,计算结果的可靠性由实测数据验证。用这种方法对3种结构形式4个实测断面的青藏铁路多年冻土区清水河试验段路堤的人为上限和融化夹层进行了数值模拟分析。计算结果表明,从人为上限形态及融化夹层范围和面积两方面来看,相同路堤高度情况下,片石通风—碎石护坡组合路堤优于片石通风路堤,而片石通风路堤优于普通路堤;对于同类型的路堤,高路堤优于低路堤。这种不同路堤结构形式的优劣性排序,可为多年冻土区路堤设计提供理论依据和技术支持。
The initial temperature field uses the measured temperature field, and the corresponding physical parameters are obtained by the inversion of the measured geothermal data by the finite element method. The reliability of the calculated results is verified by the measured data. Using this method, numerical simulation of three artificial upper bounds and melt intercalations of Qingshuihe embankment in Qinghai-Tibet section of Qinghai-Tibet Railway with three measured cross sections has been carried out. The calculated results show that the embankment of aeolian-gravel embankment is superior to the stone-ventilated embankment, while the stone-ventilated embankment is superior to common embankment for the same height of embankment from the upper limit of man-made shape and the range and area of melting intercalation. Type embankment, high embankment is better than low embankment. The advantages and disadvantages of different embankment structure sorts can provide theoretical basis and technical support for embankment design in permafrost regions.