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在多年冻土区修建铁路站场路基,打破了原来天然地表与外界的热力平衡,地下温度场将重新分布。根据此特征可以推断多年冻土的发展演化趋势以及评定路基的稳定状况,结合实际监测数据,利用AN SY S软件对路基下温度场进行有限元数值模拟。模拟计算结果表明:路基下冻土上限发生了上移,多年冻土得到了保护;试验段内冻土人为上限和未受路基影响的冻土天然上限均逐年下降;同时,路基阳坡、阴坡两侧地下的温度场分布特征的差异构成了路基不均匀变形和路面裂缝的潜在威胁。
In the permafrost region to build the railway station roadbed, breaking the original natural surface and the thermal balance of the outside world, the underground temperature field will be redistributed. Based on this feature, we can deduce the evolution trend of permafrost and evaluate the stability of embankment. Combined with the actual monitoring data, AN SYS software is used to simulate the temperature field under subgrade. The simulation results show that the upper limit of permafrost has been moved up and the permafrost has been protected. The upper limit of frozen soil and the natural upper limit of permafrost not affected by subgrade are decreasing year by year. In the meantime, The differences in the distribution of the temperature field on both sides of the slope form a potential threat to the uneven deformation of the embankment and to the crack in the pavement.