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在大量试验研究成果的基础上,运用冻土物理学、冻土力学、数值传热学、高等土力学及土动力学等基本理论,建立了冻土区道路及铁道工程路基的水-热-动力耦合数学模型(有效应力法),并编制了相应的数值分析程序。最后,以青藏铁路某典型断面为例,对冻土铁路路基在地震荷载作用下的动力响应问题进行了系统分析,并评价了路基的地震安全稳定性。结果表明,提出的冻土路基动力分析模型合理,能较好地模拟冻土铁路路基的地震反应问题。另外,当发生设计烈度以下的地震时,青藏铁路路基不会产生严重破坏,经运营管理部门的维修后即可投入正常生产。
Based on a large number of experimental results, the basic theory of permafrost, frozen soil mechanics, numerical heat transfer, advanced soil mechanics and soil dynamics are used to establish the water-heat- Dynamic coupling mathematical model (effective stress method), and prepared the corresponding numerical analysis program. Finally, taking a typical section of Qinghai-Tibet Railway as an example, the dynamic response of permafrost subgrade under earthquake load is systematically analyzed and the seismic safety and stability of subgrade are evaluated. The results show that the proposed dynamic analysis model of frozen soil subgrade is reasonable and can well simulate the seismic response of permafrost subgrade. In addition, when earthquakes with design intensities below occur, the subgrade of the Qinghai-Tibet Railway will not cause serious damage and can be put into normal production after being repaired by the operation and management department.