低于原地面的挖方路基称为路堑，指从原地面向下开挖而成的路基形式。它能起到缓和道路纵坡或越岭线穿越岭口控制标高的作用。
n. cutting
misc. through cut
路堑式明洞 cut-type open cut tunnel ; cut-type tunnel without cover ; cut-type gallery
路堑平台 platform of cutting ; berm in cutting
路堑边坡 cutting slope ; slope on road cutting ; slope of cut ; road cut slope
路堑石方爆破 rock blasting in cut ; rock cutting blasting
顺层路堑 bedding cutting
顺层岩质路堑边坡 consequent rock cutting slope
路堑开挖 cut excavation ; cutting excavation
The successful application of flexible supporting treatment technology for Beijing western sixth ring highway in 2009 was a good example for the comparative researches.
2009年柔性支护技术在北京西六环膨胀岩(土)深路堑的成功应用,为分析研究提供了一极好平台。
参考来源 - 广西、北京膨胀（岩）土特性及堑坡处治技术对比分析The collapse took place after some time of cut slope excavation which is completed is a common disease in expansive road construction projects. This destruction has no direct contact with the height and ratio of slope.
路堑开挖一段时间后边坡发生坍滑是膨胀土地区筑路常见的工程病害,且这种破坏与坡高、坡率无直接联系。
参考来源 - 百色膨胀土堑坡开挖的演化规律及柔性支护技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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