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冻土的固结是在融化的基础上进行的,是温度与变形耦合作用。为此运用传热学、冻土物理学和固结理论,考虑了水分场与温度场的相互作用,分别建立了温度场、固结变形场的数学模型。通过温度场与变形场方程的联合求解来解决二者的耦合作用,形成了冻土融化固结的数学模型。以试验路基为原型,假定未来50年升温2.6℃的条件下,对该段路基运营若干年后的热、力学状况进行分析。结果表明路基修筑以后,在冻土路基的温度场、位移场、应力场受外界影响重新分布。路基变形随着融化范围的增大而增加,分析了路基高度对路基沉降的影响,数值分析结果与现场的实际监测结果有很好的一致性。
Permafrost consolidation is carried out on the basis of melting, is the temperature and deformation coupling. For this reason, the heat transfer theory, the physics of permafrost and the consolidation theory are taken into account, and the interaction between the water field and the temperature field is considered. The mathematical models of temperature field and consolidation deformation field are respectively established. Through the joint solution of the temperature field and the deformation field equation, the coupling effect between the two is solved and the mathematic model of frozen solidification is formed. Taking the experimental subgrade as the prototype, the thermal and mechanical conditions of the subgrade after several years of operation are assumed under the condition of 2.6 ℃ warming in the next 50 years. The results show that after the subgrade construction, the temperature field, the displacement field and the stress field in the subgrade of the frozen soil are redistributed by external influences. The deformation of embankment increases with the increase of melting range. The influence of embankment height on the subgrade settlement is analyzed. The numerical analysis results are in good agreement with the actual monitoring results of the site.