Abstract: The?terrain?of?mountainous?highway?is?complex,?and?there?are?many?high-filled?embankments?which?easily?generate?deformation.?The?interaction?between?different?layers?will?further?affect?the?deformation?of?the?subgrade?in?muhilayer?high-filled?embankments.?With?the?consideration?of?different?geometric?shape?of?subgrade?and?the?physical?nature?of?materials,?the?deformation?rules?of?multilayer?and?high-filled?embankment?are?discussed?by?finite?element?method?（FEM）.?Numerical?examples?show?that?the?settlement?of?the?top?of?two?marginal?subgrades?is?uneven.?Compared?with?the?impact?of?the?slopeheight?and?density,?the?impact?of?the?slope-gradient?is?more?obvious.?In?order?to?reduce?the?negative?medial-lateral?elevation?difference?of?the?subgrade,?the?upper?subgrade?should?be?kept?away?from?the?lower?classes,that?is,?the?upper?slope-gradient?of?the?embankment?should?be?as?fiat?as?possible,?preferably?not?more?than?1?：?2?;?and?in?order?to?facilitate?the?consolidation?settlement?and?reduce?the?deformation?of?the?upper?embankment,?it?should?minimize?the?height?of?embankment?or?place?the?filling?materials?with?higher?density?in?lower?classes.

Key words: muhilayer subgrade , high-filled subgrade , deformation , slope-height , slope-gradient , density

摘要： 山区公路地形复杂,高填路基多且容易变形,多层高填路基中各路基之间的相互作用会进一步影响路基的变 形。利用有限元数值计算方法,考虑不同的路基几何形状和填料的物理性质,探讨了多层高填路基的变形规律,算 例表明坡间路基顶面两边缘沉降是不均匀的,其中坡率的影响较坡高和密度的影响更明显。为消除坡间路基内外 侧的不利高差,上层路基应尽量远离下层路基,即上层路基的边坡尽可能缓些,最好不超过1??2;而且应尽量降低 路基高度或将密度较大的填料置于下层路基中,以利于其固结沉降,减小上层路基的变形。

关键词: 多层路基, 高填路基, 变形, 坡高, 坡率, 密度