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为考察多年冻土路基在温度变化下的融沉问题,建立了相应的有限元模型。通过选取典型断面,在青藏公路实测数据的基础上进行了路基温度场计算模拟,其结果为后续的路基融沉提供了温度场-力学耦合计算的前提。路基融沉计算模型在导入温度场后,分别进行了自重作用和温度作用下的融深对地基沉降变形影响的计算。结果表明,不同的冻土融深对沉降变形影响不同。多年冻土地区修建公路,应采取措施保护冻土上限,减小路基融化深度。最后,在融沉计算的基础上提取了相应的融沉曲线回归式。
In order to investigate the thaw settlement of permafrost subgrade under the temperature change, a corresponding finite element model was established. Based on the measured data of Qinghai-Tibet Highway, the calculation of the temperature field of the embankment is carried out. The results provide the precondition of temperature-mechanical coupling calculation for the subsequent subgrade melting. Subgrade sedimentation calculation model After the temperature field is introduced, the effects of self-weight and temperature on the deformation settlement are calculated respectively. The results show that different permafrost depths have different effects on settlement deformation. Permafrost areas to build roads, measures should be taken to protect the upper limit of permafrost and reduce the depth of subgrade melting. Finally, on the basis of the thaw settlement, the corresponding regression curve of thawing settlement is extracted.