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路堤受土质和气候条件及基底地形的影响很大,有着很强的地区特点。目前黄土地区存在着两种边坡坡度及密实度的路堤:一种为标准路堤,边坡坡度按设计规范确定,但干密实度没有达到0.85～0.95δ_0的要求;另一种为当地劳动人民创造的用以跨越冲沟的特别高路堤(或称作土桥),高达30米左右时,其坡比陡于1:1(图1),有很大的技术经济优越性。对此加以总结分析,就可以提出适合这个地区的路堤密实度标准及边坡坡度。
The embankment is greatly influenced by soil and climatic conditions and basement topography, and has strong regional characteristics. At present, there are two kinds of embankment slopes and compactness in the loess area: one is a standard embankment, and the slope is determined according to design specifications, but the dry density does not meet the requirement of 0.85 to 0.95 δ_0; the other is the local working people. The particularly high embankment (or earth bridge) that was created to cross the gully, when it is about 30 meters high, has a steeper than 1:1 slope ratio (Fig. 1), which has great technical and economic advantages. After summarizing and analyzing this, it is possible to propose the compactness standards and slope gradients suitable for this area.