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冰川冻土  2011 

214国道不同路面形式下碎石护坡工程效果实测分析

, PP. 1316-1322

Keywords: 214国道,碎石护坡,沥青路面,水泥路面,地温,沉降变形

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Abstract:

沥青路面和水泥路面是214国道江河源段采用的两种基本路面形式,由于该路段地处高温不连续多年冻土区,碎石护坡等多种工程措施被用来稳定冻土路基.对两种路面形式下碎石护坡路段的地温监测资料进行综合分析发现,碎石护坡能显著降低路基边坡坡面的年平均温度,减小路基边坡坡面温度的年较差,并对坡脚、路肩和路基中心具有从大到小的冷却作用,但并不能有效减少路基左右两侧的阴阳坡差异.对于采用沥青路面的路基而言,碎石护坡仅能减缓路基下地温上升速率,但并不能阻止路基下冻土升温;水泥路面增设碎石护坡以后,尽管地温也有所上升,但同沥青路面相比地温升幅较小,路基下多年冻土基本保持稳定.对两种路面形式下碎石护坡路段的变形监测资料进行综合分析发现,完工2a后的路面沉降变形量都在10~20cm之间,采用沥青路面的路基变形量略大于采用水泥路面的路基变形量.就不同坡向所产生的变形来看,无论沥青路面还是水泥路面,靠近阳坡一侧的路基变形量均大于阴坡.

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