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青藏铁路的走向为北北东——南南西,且穿过高原高海拔地区,太阳辐射较强,其路堤及路基阴阳坡的温度场差异较大.在较为严酷的冻土条件及气候环境下,考虑青藏高原气温未来百年上升3.4℃,通过瞬态热力学的有限元计算,对抛石护坡路堤未来50年内的温度场进行了预测.计算结果表明:差异一直存在,相同月份和日期的阴阳坡温度较差随年份变化极小;阴阳坡温度场差异逐年加深,下伏土层2.5 m深处的阴阳坡温度较差最大值已小于0.5℃;9月中旬和4月下旬的路堤内的冻融线的阴阳效应剧烈;阴阳坡脚冻土上限的阴阳差异在前10年较小,10到30年间逐渐增大,30年后趋于稳定,深度相差约45 cm;路基中心下的冻土上限由建成时的1.8 m退化到第50年时的8.1 m深处.
The trend of Qinghai-Tibet Railway is north-north east-south-south-west-west, and it passes through the plateau at high altitude with strong solar radiation. The temperature field of the embankment and subgrade Yin-Yang slope is quite different. Under more severe frozen soil conditions and climatic conditions, Considering that the temperature in Qinghai-Tibet Plateau rises by 3.4 ℃ in the future, the temperature field in the next 50 years is predicted by the transient thermodynamic finite element method. The calculation results show that the difference exists all the time, and the yin-yang temperature in the same month and date The difference between the sunny and the sunny slopes deepened year by year, and the maximum temperature difference between the sunny and the sunny slopes at the depth of 2.5 m was below 0.5 ℃. The freeze-thaw in mid-September and late April embankment The yin-yang effect of the line is fierce. The difference of the yin-yang top of the permafrost in the yin-yang-slope is smaller in the first ten years, gradually increasing in ten to thirty years, and then stabilizing in 30 years, with a difference of about 45 cm in depth. Degraded from 1.8 m at completion to 8.1 m at 50 th year.