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考虑通风管路基中通风管的空气对流换热特点,摈弃把通风管的影响作为边界条件处理的方法,建立多年冻土区的通风管路基的数值模型,对设置和未设置风门的通风管路基的温度特性进行数值模拟,分析2种情况下通风管路基的调温效果,为多年冻土区的路基工程的建设和安全运营提供技术支撑。研究表明:通风管路基能够明显地降低冻土地基的温度,提高冻土的人为上限;与无风门的路基相比,有风门的通风管路基降低冻土地基的温度的效果更加明显,降温作用发生得更早,冻土人为上限的提高幅度更大,路基中心和路肩下的地基温度降低更快,且温度分布较均匀,路基温度稳定所需要的时间减少。
Considering the characteristics of air convection heat transfer of ventilating pipe in ventilation pipe foundation, we abandon the method of dealing with the influence of ventilation pipe as the boundary condition, establish the numerical model of ventilating pipe subgrade in permafrost region, The temperature characteristics of the ventilation pipelines in two cases were analyzed and the technical support was provided for the construction and safe operation of subgrade construction in permafrost regions. The results show that ventilated pipe foundation can obviously reduce the temperature of permafrost foundation and increase the man-made upper limit of permafrost. Compared with the non-damped subgrade, the effect of ventilated pipe foundation with damper on lowering the temperature of permafrost foundation is more obvious, Occurred earlier, and the per capita upper limit of frozen soil increased more rapidly. The temperature at the subgrade center and the road shoulder dropped faster and the temperature distribution was more uniform, and the time needed to stabilize the subgrade was reduced.