论文部分内容阅读
建立了多年冻土路基温度场的三维数值计算模型,并采用有限元方法对普通路基、热棒路基在未来50年内气温上升2.6℃情况下的温度场进行了预报分析和比较,研究中考虑了路基阴阳坡差异,并以现场实测地温数据为依据。计算结果表明:路基阴阳坡的热差异会导致路基下伏土层温度场不对称,由此可引起路基横向的不均匀变形;在气温升高条件下,未来50年内普通路基将会产生较大融沉变形,不能保证路基的长期稳定性,加热棒后的路基融化深度均小于普通填土路基的融化深度,阴阳坡温度差异也有明显降低,说明热棒结构路基可以抵消气候变暖的影响,从而可以保证路基的稳定性。
The three-dimensional numerical model of the temperature field of permafrost subgrade is set up and the temperature field of ordinary embankment and hot rod subgrade are predicted and compared in the future 50 years by using the finite element method. The temperature field is considered and compared in the study Subgrade difference between yin and yang, and to the actual measured ground temperature data as the basis. The calculation results show that the thermal differences between the Yin and Yang slopes can lead to the asymmetry of the temperature field beneath the subgrade so as to cause the inhomogeneous deformation of the subgrade. Under the condition of increasing temperature, the common subgrade will have larger Thaw deformation, can not guarantee the long-term stability of the subgrade, the melting depth of the subgrade after the heating rod is less than the melting depth of the ordinary filling embankment, the temperature difference between the yin and yang slope is also significantly reduced, indicating that the hot rod structure subgrade can offset the impact of climate warming, Which can ensure the stability of roadbed.