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冰川冻土  2014 

透壁式通风管-块石复合气冷路基室内模型试验研究

DOI: 10.7522/j.issn.1000-0240.2014.0104, PP. 870-875

Keywords: 路基工程,降温效果,模型试验,透壁式通风管-块石复合气冷路基,多年冻土

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Abstract:

为了研究透壁式通风管-块石复合气冷路基的降温效果,针对年均气温约-3.5℃,平均风速2.5m·s-1,主导风向为西北方向的高原环境条件开展室内模型试验,分析了单一块石气冷路基和透壁式通风管-块石复合气冷路基的孔隙空气对流速度、特征点地温变化过程以及模型整体温度场变化过程.结果表明在透壁式通风管的疏导作用下,透壁式通风管与块石层的复合结构能够起到强化路基体对流的效果,复合路基块石孔隙中的空气流速比单一块石路基提高约20%,由此导致复合路基模型底部的降温幅度是单一块石路基模型的2.2倍.模型整体温度场表明,复合路基能够起到储存冷量、降低下伏多年冻土地温的作用.

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